Perencanaan Agregat Mixed

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Agregat Planning, Metode Mixed

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Soal 1 (Contoh Permasalahan)0.14653Unit/hariHiring Cost =500dollarLay Off Cost =1000DollarInventory Cost / unit =80DollarBanyak Pekerja Bulan Desember300WorkersInventaris akhir desember500UnitInventaris Akhir Juni600UnitChase MethodTidak Mempertimbangkan Inventaris akhir bulan Desember baik sebagai stok maupun inventaris Mempertimbangkan Inventaris Bulan Desember sbg stok, maka produksi blan januari = 780-500 = 280 unit sajaMempertimbangkan Inventaris Bulan Desember sbg InventarisPeriodeWorking DaysUnits Produced/worker Forecast Net DemandMin N.WorkersPeriodeWorking DaysUnits Produced/worker Forecast Net DemandProductionMin N.WorkersPeriodeWorking DaysUnits Produced/worker Forecast Net DemandMin N.WorkersABC = (B x 0.14653)DE = D/CABC = (B x 0.14653)DEF = E/CABC = (B x 0.14653)DE = D/C

January202.931780267January202.93178028096January202.931780267February243.517640182February243.517640640182February243.517640182March182.638900342March182.638900900342March182.638900342April263.8101200315April263.81012001200315April263.8101200315May223.2242000621May223.22420002000621May223.2242000621June152.1982000910June152.19820002000910June152.1982000910

PeriodeN.WorkerN.HiredN.FiredUnits/WorkerProductionCum. Prod.Cum. DemandInventoryPeriodeN.WorkerN.HiredN.FiredUnits/WorkerProductionCum. Prod.Cum. DemandInventoryPeriodeN.WorkerN.HiredN.FiredUnits/WorkerProductionCum. Prod.Cum. DemandInventoryABCDEF = B x EGHIABCDEF = B x EGHIABCDEF = B x EGHI500January2670332.9317837837803January9602042.9312812812801January2670332.9317837837803February1820853.517640142314203February1828603.5176409219201February1820853.517640142314203March34216002.638902232523205March34216002.638902182318203March34216002.638902232523205April3150273.8101200352535205April3150273.8101200302430204April3150273.8101200352535205May62130603.2242002552755207May62130603.2242002502550205May62130603.2242002552755207June91028902.1982000752775207June91028902.1982000702670206June91028902.1982000752775207600600600Total 755145630Total 755231621Total 7551451130Total Biaya =572900Total Biaya =658180Total Biaya =612900Level MethodPeriodeCum. DemandCum. Produce/WorkerRasio ABCD = B/ CJanuary7802.931267February14206.448221March23209.086256April352012.896273May552016.120343June752018.318411

Pekerja min = 411, bulan januari harus merekrut 411-300 = 111 pekerja

PeriodeUnits Produced/worker Montly ProductionCum. Prod.Cum. DemandEnd. Inv.ABC = B x 411DEFJanuary2.930612051205780425February3.516721445265014201230March2.637541084373423201414April3.809781566530035201780May3.223661325662555201105June2.19795903752875208600Total6562

Total Cost =580460

Soal 2 (Tugas 1)Wkt Prod/Unit0.2JamProduktifitas Pekerja Reguler/hari40UnitAsumsiJam Kerja Reguler8JamProduktifitas Pekerja Lembur/hari10Unit Max pekerja15orangJam Kerja Lembur(Overtime)2JamJumlah pekerja awal 15orangReg. Cost / Jam4000RupiahKekurangan produksi menjadi biaya shortageOvertime Cost/Jam5000RupiahKelebihan produksi menjadi biaya inventoryInv. Cost /Unit Blan100RupiahShotage/unit200RupiahHire Cost600000RupiahFired Cost900000RupiahChase Periode Hari KerjaKapasitas Produksi Reg/ Bulan Kapasitas Produksi Lembur/ BulanKapasitas Produksi Reg+Lembur/ BulanDemandMin N.WorkersABCDEFG = F/EJanuary2080020010001000010February187201809002500028March2080020010002000020April2080020010001500015May2080020010001000010June2080020010002000020

Periode Max.N.WorkerN.HiredN.FiredUnit/WorkerProductionKekuranganSortageABCDEF = B*EProduksi-demandGJanuary100510001000000February155090013500-1150011500March1500100015000-50005000April150010001500000May100510001000000June1500100015000-50005000Total510Periode Reg. CostOvrtm.CostHire CostFire CostShortageTotal Cost/PeriodeABCDEFGJanuaryRp6,400,000Rp2,000,0000.0Rp4,500,0000.0Rp12,900,000FebruaryRp16,000,000Rp5,000,000Rp3,000,0000.0Rp2,300,000Rp26,300,000MarchRp12,800,000Rp4,000,0000.00.0Rp1,000,000Rp17,800,000AprilRp9,600,000Rp3,000,0000.00.00.0Rp12,600,000MayRp6,400,000Rp2,000,0000.0Rp4,500,0000.0Rp12,900,000JuneRp12,800,000Rp4,000,0000.00.0Rp1,000,000Rp17,800,000Total CostRp100,300,000LevelPeriode Cum. DmndCum. Kapasitas Produksi Reg+Lembur/ BulanRasioBCD = B/CJanuary10000100010February35000190018March55000290019April70000390018May80000490016June100000590017Pekerja min = 16, bulan januari harus merekrut 1 pekerja, tetapi karena kapasitas produksi max 15 pekerja maka tidak ada perekrutanPeriode Unit Produce in reg time /mounthUnit Produce in Ovrtime /mounthProduksi Reg + OvertimeCum. ProduksiEnd. InvShortage

January12000300015000150005000February108002700135002850011500March12000300015000435005000April1200030001500058500May1200030001500073500June12000300015000885005000

Periode Reg. CostOvrtm. CostShortageInv. CostTotal CostJanuaryRp9,600,000Rp3,000,0000.0Rp500,000Rp13,100,000FebruaryRp8,640,000Rp2,700,000Rp2,300,0000.0Rp13,640,000MarchRp9,600,000Rp3,000,000Rp1,000,0000.0Rp13,600,000AprilRp9,600,000Rp3,000,0000.00.0Rp12,600,000MayRp9,600,000Rp3,000,0000.00.0Rp12,600,000JuneRp9,600,000Rp3,000,000Rp1,000,0000.0Rp13,600,000Total CostRp79,140,000

Soal 2 (Tugas 1) MixedBulanKebutuhanHari KerjaProduksi/ 1 unit =0.2jamAsumsiKapasitas produksi11000020Jam Reguler =8jam =40unit per hari Max pekerja15orangPeriode15 pekerja22500018Jam Lembur =2jam =10unit per hari Jumlah pekerja awal 15orangRegulerLembur32000020BiayaKekurangan produksi menjadi biaya shortage112000300041500020Jam Reguler =4000per jam =100per unitKelebihan produksi menjadi biaya inventory210800270051000020Jam Lembur =5000per jam =500per unit312000300062000020Simpan =100per unit per bulan4120003000Shortage =200per unit5120003000Hire =600000per pekerja6120003000Fire =900000per pekerja

Min =100*(R1+R2+R3+R4+R5+R6)+500*(O1+O2+O3+O4+O5+O6)+100*(I1+I2+I3+I4+I5+I6)+200*(S1+S2+S3+S4+S5+S6)Subject toR1+O1+S1-I1=10000R1