0.14653 Unit/hari Hiring Cost = 500 dollar Lay Off Cost = 1000 Dollar Inventory Cost / unit = 80 Dollar Banyak Pekerja Bulan Dese 300 Workers Inventaris akhir desember 500 Unit Inventaris Akhir Juni 600 Unit Chase Method Tidak Mempertimbangkan Inventaris akhir bulan De Periode Working D Units Pro Forecast Min N.Wor A B C = (B x D E = D/C January 20 2.931 780 267 February 24 3.517 640 182 March 18 2.638 900 342 April 26 3.810 1200 315 May 22 3.224 2000 621 June 15 2.198 2000 910 Periode N.Worker N.Hired N.Fired Units/Wor A B C D E January 267 0 33 2.931 February 182 0 85 3.517 March 342 160 0 2.638 April 315 0 27 3.810 May 621 306 0 3.224 June 910 289 0 2.198 Total 755 145 Total Biaya = 572900 Level Method Periode Cum. Dema Cum. Prod Rasio A B C D = B/ C January 780 2.931 267 February 1420 6.448 221 March 2320 9.086 256 April 3520 12.896 273 May 5520 16.120 343 June 7520 18.318 411 Pekerja min = 411, bulan januari harus merekrut
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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
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