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Transcript of Profit and Loss Booklet | Pathfinderforme
Percentage and Applications
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Arithmetic Book-2
Pathfinder Education Services
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Percentage and Applications
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1
S.No. Topic Page
3. Profit and Loss 2
4. Exercise-1 8
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CHAPTER-2-PROFIT & LOSS
Profit and Loss questions are simply applied
percentage questions. For all practical purposes, if
you understand the basics of percentage, you are
ready to solve any question of profit and loss.
SOME BASIC DEFINITIONS
Cost Price
The price at which you buy anything is Cost price.
Selling Price
The price at which an article is sold is called selling
price.
Profit or Gain
When an article is sold for more than what it costs
we say there is a profit or gain. Thus,
Profit = S.P. – C.P.
% Profit = SP−CP
CP× 100
Note: Unless mentioned otherwise in the question,
the profit percentage is always calculated on the
cost price of the item.
Loss
When an article is sold for less than what it costs we
say there is loss. Thus,
Loss = C.P. – S.P.
% loss = CP−SP
CP× 100
Note: Unless mentioned otherwise in the question,
the loss percentage is always calculated on the cost
price of the item.
Marked Price
List price or the price printed on the article is known
as Marked Price (abbreviated as M.P.)
Discount
Sometimes dealers allow some reductions on list
price or marked price. This reduction is known as
discount.
% Loss = MP−SP
MP× 100
Note: Unless mentioned otherwise in the question,
the discount percentage is always calculated on the
marked price of the item.
Premium
In some situations, dealers are able to sell their
goods at a price higher than the stated Marked
price. The difference between the the higher selling
price, in this case, and marked price is called as
premium.
% premium = SP−MP
MP× 100
Note: Unless mentioned otherwise in the question,
the premium percentage is always calculated on the
marked price of the item.
QUESTIONS ON BASIC CALCULATIONS
Example- 1. If C.P.=125, S.P. = 96, then loss = ?
Loss= CP-SP = 125 – 96 = Rs 29
Example-2 If C.P.=112, S.P.=132, then Gain =?
Gain = SP-CP = 132-112 = Rs 20
Example-3 If C.P.=120, S.P. = 90, then loss % = ?
% loss = CP−SP
CP× 100 =
120−90
90× 100. = 33
1
3 %
USEFUL INTERPRETATION OF PROFIT AND LOSS
For all practical purposes, profit % stands for the
percentage by which SP is greater than CP and loss
stands for the percentage by which SP is less than
CP
Why?
From our discussion of the percentages, we know
that the percentage by which A is greater than B is
given by 𝐴−𝐵
𝐵× 100
In the above expression, replace A by SP and B by CP
and you will get the formula for profit percentage.
Therefore,
if the profit percent is 10%, SP is more than CP by
10%, therefore
(i)SP = 1.1CP
(ii) SP = CP. + 10% of CP
If the profit percent is 20%, SP is more than CP by
20%, therefore,
(i)SP = 1.2CP
(ii) SP = CP. + 20% of CP
If loss percent is 10%, SP is less than CP by 10%,
therefore,
(i)SP = 0.9 CP
(ii) SP = CP. - 10% of CP
In general
SP =100±R
100× CP
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Where R is positive if there is a profit and R is
negative in case of a loss.
IMPORTANT POINTS
If you sell two items which have the same CP,
gaining R% on one and losing R% on the other,
overall there is no profit or loss.
If you sell two items at the same SP, gaining R%
on one and losing R% on the other, overall there
is always a loss = R2
100 %
Example-4 The selling price of a commodity is Rs
720. If the trader earns a profit of 20%, what is his
cost price?
Solution:
Since the trader earns a profit of 20%
SP = 100+20
100× CP. = 720
1.2 CP = 720
CP = Rs 600
[Ans: Rs 600]
Example-5 The selling price of a commodity is Rs
720. If the trader earns a loss of 10%, what is his cost
price?
Solution:
Since the trader earns a loss of 10%
SP = 100−10
100× CP. = 720
0.9 CP = 720
CP = Rs 800
[Ans: Rs 800]
Example-6 A man buys 6 items for a rupee and sold
at the rate of 5 items for a rupee. What is the gain
or loss percent?
Solution:
Cost price of the item = 1/6 Rs
SP of the item = 1/5 Rs
Percentage profit = 1/5−1/6
1/6× 100 = 20%
[Ans: 20%]
Example-7 A man buys 12 items for a rupee. How
many items for a rupee should he sell in order to
gain 20%?
Solution:
CP = 1/12
When the gain is 20%, SP = 1.2CP or 120% of CP
SP = 1.2 (1/12) = 1/10 Rs
Number of items sold for a rupee = 1
110⁄
= 10 items
[Ans: 10]
QUESTIONS ON CALCULATING MARKED PRICE ,
SELLING PRICE, DISCOUNT% AND PREMIUM
PERCENTAGE
Example-7 A trader buys an article for Rs 600 and
marks it up by 20%. He then gives a discount of 10%
on the marked price. Find the selling price of the
item
Solution:
CP = Rs 600 ; Mark up % = 20 ; Discount % = 10%
Marked price = CP + 20% of CP or 120% of CP
Marked Price = 600 + 20% of 600. =Rs 720
SP = Marked Price – 10% of Marked Price
or 90% of MP
= 720 – 10% of 720 = Rs 648
[Ans: Rs 648]
Example-8 A trader buys an article for Rs 800 and
marks it up by 25%. He then gives a discount of 5 %
on the marked price. Find the selling price of the
item
Solution:
CP = Rs 800
Marked Price = 800 + 25% of 800 or 125% of 800
Marked Price = Rs 1000
SP = 1000-5% Of 1000 = Rs 950
[Ans: Rs 950]
Example-9 A man buys an item for a discount of
20%. On selling the item for Rs 600, the man earns
a profit of 20%. By what percent is the marked price
of the item higher than the cost price?
Solution:
SP= Rs 500 ; Discount %= 20 ; Profit % = 20
Since there is a 20% profit, therefore
SP = 120% of CP
600 = 120% of CP or CP = Rs 500
Since there is a discount of 20%, we have
SP = MP-20% of MP = 80% of MP
600 = 80% of MP or MP =Rs 750
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Percentage by which MP is more than CP
=MP−CP
CP× 100 =
750−500
500× 100 = 50%
Method-2
We must recognize that SP can be calculated from
two ways: from CP and from MP
120% of CP = SP = 80% of MP
Or 120% of CP = 80% of MP
MP
CP=
120
80
MP
CP= 1.5
MP = 1.5 CP
which means MP is 50% more than CP
[Ans: 50%]
Example-10 On selling an item for a discount of 30%
a man gains 26%. What is the gain if the discount
percentage is 10%?
Solution:
According to the question, gain is 26% therefore,
If CP = Rs 100
SP = 100+ 26% of 100 = Rs 126
Similarly if discount % = 30%
SP = MP-30% of MP
126 = MP-30% of MP
126 = 70% of MP
MP = Rs 180
Now if the discount percent is 10%, we have
SP= 180-10% of 180 = Rs 162
Gain % = 162−100
100× 100 = 62%
Method-2
SP = 126% of CP=70% of MP
MP
CP=
126
70
MP =1.8CP
On discounting MP by 10% we have
SP = 1.8CP-10% of CP = 1.62CP
SP=1.62CP
Or 62% profit
[Ans: 62%]
Example-11 The cost price of 10 items is equal to
the selling price of 8 items. What is the gain or loss
percent?
Solution:
Method-1
The first method relies on making appropriate
assumptions to solve the above question. We
assume some value for CP of 10 items and SP of 8
items.
Since it is the same number, we will be better of by
assuming some value that is a multiple of both 10
and 8. Therefore taking the LCM of (8, 10) = 40
CP of 10 items = SP of 8 items = Rs 40
CP of 10 items = 40
CP= Rs4
SP of 8 items = Rs 40
SP = Rs 5
Gain % = 5−4
4× 100 = 25%
Method-2
Gain % = SP−CP
CP× 100 =
Gain % = (SP
CP−
𝐶𝑃
𝐶𝑃) × 100
Gain% = (SP
CP− 1) × 100
From the above, we can see that to calculate gain
percentage, we simply require the ratio of SP and
CP
From the information provided in the question we
have
CP of 10 items = SP of 8 items
10 CP= 8SP
SP
CP=
10
8
SP
CP= 1.25
SP= 1.25 CP or SP = 125% of CP
The above equation easily tells us that the profit
percent is 25%
[Ans: 25%]
Example-12 The cost price of 15 items is equal to
the selling price of 20 items. What is the gain or loss
percent?
Solution:
Example-13 On selling 12 items, a man gains selling
price of 2 items. What is the gain percentage of the
man?
Solution:
For the above question, assume the SP to be Rs 10
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Sale on selling 12 items = 12 x 10 = Rs 120
Profit on selling 12 items = 2 x 10 = Rs 20
Cost = Sale – Profit = 120-20 = Rs 100
Gain percentage = 120−100
100× 100 = 20%
[Ans: 20%]
Example 14. A man sold a horse at a loss of 7%. Had
he been able to sell it at a gain of 9%, it would have
fetched Rs 64 more than it did. What was the cost
price?
Solution: If the cost of the horse = Rs. x
Then, SP at a loss of 7% = 0.93
SP at a gain of 9% = 1.09 x
It is given that
=> 1.09 x – 0.93 x = 64
=> 0.16 x = 64, or x = 400
[Ans: Rs 400]
Example 15. A dealer sold a radio at a loss of 2.5%.
Had he sold it for Rs. 100 more, he would have
gained 7.5%. For what value should he sell it in order
to gain 20 %?
Solution: Let CP of radio be Rs. x
Selling at a loss of 2.5% SP = 97.5% of x = 0.975x.
Also given, (0.975 x + 100) as SP would yield a gain
of 7.5%
But when gain is 7.5%, SP = 107.5% of CP
107.5% of CP = 97.5% of CP + 100
10% of CP = 100
CP= Rs 1000
To gain 20%, the dealer should sell at 120% of CP
SP = 120% of 1000 = Rs 1200
Shortcut Method:
Note that if the radio is sold for Rs 100 more, then
S.P. changes from 97.5% of C.P. to 107.5% of C.P.
Therefore, Rs 100 must amount to a 10% change in
C.P.
10% of C.P. = Rs. 100
C.P. = Rs 1000
For 20 % gain,
S.P. = 120% of 1000= Rs 1200
[Ans: Rs 1200]
Example 16. A person sells an article at a profit of
10%. If he had bought it at 10% less and sold it for
Rs. 3 more, he would have gained 25%. Find the cost
price.
Solution: Let CP be = x; SP = 110% of x = 1.1x
If New CP = 0.9 x and New SP = 1.1 x + 3
then, gain% = 25
Gain % = (1.1x+3)−0.9x
0.9x× 100 =25
0.2x+3 = 0.25 x 0.9x
0.2x+ 3 = 0.225x
0.025x =3
X= Rs 120
[Ans: Rs 120]
Example 17. An article is sold at 20% profit. If its
cost price is increased by Rs 50 and at the same time
if its selling price is also increased by Rs. 30, the
percentage of profit reduces to 8%. Find the cost
price.
Solution: Let the original cost price be Rs. x
Then, original selling price is Rs. 1.2 x
New SP = 1.2x + 30
New CP= x + 50
Gain % = (1.2x+30)−(x+50)
x+50× 100 = 8
0.2x- 20 = 0.08 (x+50)
0.12x = 24
x = Rs 200
[Ans: Rs 200]
Example 18. A sells a bicycle to B at a profit of 30%
and B sells it to C at a loss of 20%. If C pays Rs. 520
for it, at what price did A buy?
Solution: The detailed algebraic method of solving
such problems is as follows:
Let x be C.P. of cycle to A.
Then CP of B = 130% of x = 1.3 x
And CP of C = 80% of (1.3) x = Rs. 520
x = Rs 500
[Ans: Rs 500]
Example 19. If goods be purchased for Rs 840, and
one-fourth be sold at a loss of 20%, at what gain per
cent should the remainder be sold so as to gain 20%
on the whole transaction?
Solution: Total Cost of goods = Rs. 840
Cost of one fourth of the goods = Rs 210
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S.P. of one fourth = 0.8 x (210) = 168
Gain desired = 20%
Total Revenue = 1.2 x (840) = 1008
Additional Revenue = 1008 – 168 = Rs. 840
Cost of remaining goods = 840 – 210 = Rs. 630
Since Rs. 840 have to be realized by selling goods
which cost Rs. 630.
% Profit = 840−630
630× 100 = 33
1
3 %
[Ans: Rs 𝟑𝟑𝟏
𝟑 % ]
Example 20. A man purchases 5 horses and 10 cows
for Rs 10000. He sells the horses at 15% profit and
the cows at 10% loss. Thus, he gets Rs. 375 as profit.
Find the cost of 1 horse and 1 cow separately.
Solution: Let Rs. x be the cost of one horse
Then, 5x will be the cost of 5 horses and
Rs. (10000 – 5x) cost of 10 cows.
Total profit = Profit on horses + Profit on cows
=> 375 = 0.15 (5x) -0.1(10000-5x)
=> 375 = 0.75x – 1000 + 0.50x
=> 1375 = 1.25x
=> x = Rs. 1100
Cost of 10 cows = 10000 – 5500 = Rs 4500
Cost of 1 cow = Rs 450
[Ans: Rs 1100, Rs 450]
Example 21. A dishonest dealer professes to sell his
goods at cost price, but he uses a weight of 950 gm
for the kg weight. Find his gain percent.
Solution:
In such questions, the trader uses a faulty weight to
weigh goods while selling. But when the trader or
the dealer buys goods, the correct weight is used.
Thus, is the trader is using a weight of 950g instead
of a kg weight the following should happen:
- While selling he will charge for 1 kg but will give
away only 950 g of goods
- While buying he will buy only 950g of goods and
will pay for only 950g of goods.
Assume that the cost price = Re 1 per gram
Total cost of the trader to buy 950g = Rs 950
While selling, though he claims to sell at cost price,
he claims to sell 1000 g despite giving away only
950g worth of material.
Therefore,
SP = Re 1 per gram = CP
Sale for 1000g = Rs 1000
gain % = 1000−950
950× 100 = 5
5
19 % gain
[Ans: 55
19 % ]
Example 22. A dishonest dealer sells goods at a loss
of 5%. But instead of 1 kg he uses a weight of 900
gm while selling. Find his percentage gain.
Solution:
The trader uses a faulty weight to weigh goods
while selling. But when the trader or the dealer buys
goods, the correct weight is used.
Thus, is the trader is using a weight of 900g instead
of a kg weight the following should happen:
- While selling he will charge for 1 kg but will give
away only 900 g of goods
- While buying he will buy only 900g of goods and
will pay for only 900g of goods.
Assume CP = Re1 per gram;
SP = 1- 5% of 1 = 0.95 per gram
The cost of the trader = 1 x 900 = Rs 900
The sale of the trader = 0.95 x 1000 = Rs 950
gain % = 950−900
900× 100 = 5
5
9 % gain
[Ans: 55
9 % ]
Example 23. Nandlal purchased 20 dozen notebooks
at Rs 48 per dozen. He sold 8 dozen at 10% profit
and the remaining 12 dozen at 20% profit. What is
his profit percentage in this transaction ?
Solution: Total investment on buying 20 dozen
notebooks = 20 x 48 = Rs. 960
Sales is in two parts:
Sales 1 @ 10% profit: 8(1.1)48 = 422.4
Sales 2 @ 20% profit: 12(1.2)48 = 691.2
Net sales = 422.4 + 691.2 = Rs 1113.6
gain % = 1113.6−960
960× 100 = 16% gain
[Ans: 16 % ]
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Example 24. A man purchased a certain number of
mangoes at 3 per rupee and the same number at 4
per rupee. He mixes them together and sells them at
3 per rupee. What is his gain or loss percent?
Solution: Let x be the number of mangoes
purchased at each of the given rates
First type of mangoes he bought at 3 per rupee
CP of one mango = = 1
3
CP of x mangoes = = x
3
Then, total cost of purchase
= x
3+
x
4=
7x
12
SP of each mango = 1
3
Sale on selling 2x mangoes = 2x
3
gain % = 2x
3−
7x
127x
12
× 100
gain % = x
7x× 100 = 14
2
7 %
Method-2
To solve questions where the number of mangoes
bought of each kind is the same, we need to assume
a number such that the purchase price of each type
must be an integer.
For example, suppose the man purchased a
multiple of 3, he will get an integer value for the
total purchase price of the first type of mangoes.
Similarly, if he purchases a number of mangoes that
is a multiple of 4, he will get an integer value of the
total cost of the 2nd type of mangoes.
To get an integer value for the cost of both types of
mangoes, we must assume that he buys a number
of mangoes that is a common multiple of 3 and 4.
The LCM of 3 and 4 = 12
Assume that the man buys 12 mangoes of each type
Cost of purchase of the first type of mangoes = 12/3
= Rs 4
Cost of the purchase of the 2nd type of mangoes =
12/4 = Rs 3
Total cost of purchase = Rs 7
SP of one mango = 1/3
Total sale on selling 24 mangoes = 24/3 = Rs 8
Profit % = 8−7
7× 100 = 14
2
7 %
[Ans: 𝟏𝟒𝟐
𝟕 %]
Example 25. A trader allows a discount of 5% for
cash payment. How much % above cost price must
he mark his goods to make a profit of 10% ?
Solution: Assume that the C.P. = Rs 100
S.P. for 10% profit = Rs 110.
M.P. must be such that on giving a discount of 5%
of the M.P., he sells the item at Rs 110
95% of M.P. = Rs. 110
M.P. = 110
95× 100 =
2200
19= 115
15
19 Rs.
The % by which M.P. is greater than C.P.
=115
15
19−100
100 × 100 = 15
15
19 %
[Ans: 𝟏𝟓𝟏𝟓
𝟏𝟗 %]
Example 26. A horse worth Rs 9000 is sold by A to
B at 10% loss. B sells the horse back to A at 10% gain.
What is the gain of B ?.
Solution:
Initial CP of A = Rs 9000
SP of A= CP of B= 90% of 9000= Rs 8100
SP of B= CP of A = 110% OF 8100 = Rs 8910
Gain of B = SP of B- CP of B= 8910 -8100= Rs 810
[Ans: 𝐑𝐬 𝟖𝟏𝟎
Example 27. A man sells two horses for Rs 1710. The
cost price of the first is equal to the selling price of
the second. If the first is sold at 10% loss and the
second at 25% gain, what is his total gain or loss (in
rupees)
Solution:
CP of the first horse = x
SP of the 2nd horse = x
SP of the first horse = 1710-x
Loss on the sale of the first horse = 10%, therefore
90% of x = 1710-x
1.9x = 1710
x = 900 = CP of the first horse and SP of 2nd
The 2nd horse is sold at a gain of 25% therefore
900 = 125% of y
Y= CP of the 2nd horse
y =720
Total cost = 900 + 720 = Rs 1620
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Total sale = Rs 1710
Net gain = 1710 – 1620 = Rs 90
[Ans: Rs 90]
Example 28. If a dishonest shopkeeper measures 4
cm less of a metre then find how much percent he
earns by this way.
Solution:
First, let us understand what this question implies.
When the shopkeeper sells, he measures 4cm less
than a metre but charges money for one metre.
Thus the following two things are meant by the
above question
- The shopkeepers cost is 96 cm of cloth
-The shopkeepers revenue is 100 cm of cloth.
Assuming that his CP and SP are the same. = Re 1
per cm of cloth
Cost of the trader = Rs 96
Sale of the trader = Rs 100
Profit% = 100−96
96× 100 = 4
1
6 %
[Ans: 41
6 %]
EXERCISE-1
1. A dealer buys at the rate of 100 wristwatches for Rs 5060 and sells at the rate of 110 watches for Rs 5060 In this business his loss% was
(a) 111
9% (b) 33
1
3%
(c) 162
3 % (d) 9
1
11
2. A motor – cycle is sold at a gain of 18%. if it had been
sold for Rs 490 more then , 23% would have been gained . The cost price of the motor – cycle is
(a) Rs. 10500 (b)Rs 9500 (c) Rs 9800 (d) Rs 12000 3. A man sells two houses at the rate of Rs 1995 lakh
each. On one of the gains 5% and on other he loses 5% his gain or loss percent in the whole transaction is
(a) 0.25% loss (b) 0.25% gain (c) 2.5% loss (d) neither loss, nor gain 4. Successive discount of 30% and 10% are equivalent
to a single discount of (a) 30% (b) 40% (c) 37% (d) 45% 5. By selling an article for Rs. 69, there is a loss of 8%.
When the article is sold for Rs. 78 the gain or loss percent is
(a) neither loss nor gain (b) 4% gain (c) 4% loss
(d) 40% gain 6. Profit after selling an article for Rs. 425 is the same
as the loss after selling it for Rs 355. The cost of the article is
(a) Rs. 385 (b) Rs .390 (c) 395 (d) 400 7. If I had purchased 11 articles for Rs. 10 and sold all
the articles at the rate of 10 for Rs. 11, the Profit percent would have been (a) 10% (b) 11% (c) 21% (d) 100% 8. If a merchant estimates his profits as 20% of the
selling price, what is his real profit percent? (a) 20% (b) 22% (c) 25% (d) 30% 9. A stockists wants to make some profit in selling
sugar. He contemplates about various methods.
Which of the following would maximise his profit?
I. Sell sugar at 10% profit
II. Use 900 gm of weight instead of 1 kg and sell at
CP
III. Mix 10% impurities in sugar and sell at CP
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IV. Increase the price by 5% and reduce weights by
5%
(a) IV (b) II
(c) I (d) II or IV
10. A company sells it colour TVs in market at Rs 8400.
Of this 30% are the manufacturing costs, 25%
marketing costs and 15% administration expenses,
rest is profit. Next year, if the manufacturing
expenses go up by 20%, marketing expenses by 10%,
and the company increases the selling price by 10%,
what will be the percentage increase/decrease in
profit?
(a) 0% (b) 10%
(c) 7% (d) 5%
11. If (Cost Price/Selling Price) × 100 = 75, what percent
of cost price is profit?
(a) 25% (b) 33 1
3 %
(c) 40% (d) None of these
12. An article is sold at a profit of 20%. If both the cost
price and selling price are Rs 100 less, the profit will
be 4% more. Find the cost price.
(a) Rs 600 (b) Rs 400
(c) Rs 460 (d) Rs 480
13. A shopkeeper claims to sell milk at 9 1
11 % loss, but
he adulterates milk with water. In what ratio does he
mix milk with water to gain 16 2
3 %
(a) 17 : 60 (b) 17 : 77
(c) 60 : 17 (d) 54 : 39
14. A person purchases 80 clocks and sells 30 at a gain
of 10% and 50 at a gain of 20%. Had he sold all of
them at a uniform profit of 15%, he would have got
Rs 400 less on total sales. Find the cost price of each
clocka
(a) Rs 400 (b) Rs 333.33
(c) Rs 420 (d) Rs 560
15. A manufacturer of a certain item can sell all he can
produce at the selling price of Rs. 60 each. It costs
him Rs. 40 in materials and labour to produce each
item and he has overhead expenses of Rs. 3000 per
week in order to operate that plant. The number of
units he should produce and sell in order to make a
profit of at least Rs. 1000 per week is
(a) 400 (b) 300
(c) 250 (d) 200
16. A shopkeeper sold an article for Rs. 6,750 after
giving a discount of 10% on the labelled price. He
would have earned a profit of 50%, had there been no
discount. What was the actual percentage of profit
earned ?
(a) 36 (b) 40
(c) 35 (d) None of these
17. A house costs C rupees. Later it was sold for a profit
of 25%. What is the capital gains tax if it is 50% of
the profit?
(a) C/24 (b) C/8
(c) C/4 (d) C/2
18. If selling price is doubled, the profit triples. Find the
profit percent.
(a) 66 2
3 (b) 100
(c) 105 1
3 (d) 120
19. A showroom owner sells a leather jacket for Rs. X
and claims to make a profit of 10%. He plans to have
a stall in the trade fair and marks the same jacket at
Rs. 2X. At the stall, he allows a discount of 20%.
What will be the percentage profit that he will make
at the trade fair ?
(a) 80% (b) 60%
(c) 76% (d) None of these
20. A shopkeeper sells wheat at a profit of 10% and uses
weights which are 20% less than the actual weight.
The total gain earned by him will be
(a) 30% (b) 88%
(c) 37.5% (d) None of these
Percentage and Applications
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Answer Key
1( d) 2(c) 3(a) 4(c)
5(b) 6(b) 7(c) 8(c)
9(b) 10(d) 11(b) 12(b)
13(c) 14(a) 15(d) 16(c)
17(c) 18(b) 19(c) 20(c)