Cost $ 20 3.0 Constraints Initial Work 1250 Maximum 20 Starting inve 50 Ending inve 50 Item Materials costunit Inventory holding costurilmantin Marginal cost of stockoutunit month Hiring and training cost worker Layoll cost worker Labor hours required unit Regular time cost hour Working days per month Working hours per day Over time cost hour Marginal subcontracting costunit Unit Price $ 0.1667 20 20.0 8.0 30.0 $40 O: It St Overtime Inventory Stockout 0 50 0 C! Subcontract 0 P P Production D D Demand Aggregate Plan Decision Variables demand, inventory production in 00s) Decision Variables H . W: Period Hired 3 Laid off Workforce 0 0 0 1.250 1 2 3 4 5 6 7 8 9 10 11 12 1.-1-1-H,+L=0 1,000 1,100 1,000 1,200 1,500 1,600 1,600 900 1,100 800 1,400 1.700 1:-1+P+C-D-S:-1-1, +S,= 40W, +0:4-P.20 10W,-0,20 d Constraints Inventory Inventory Balance Period Costs Regular time Hiring Lay off Overtime Inventory Stockout Subcontract Material Extra Capacity Extra OT 1 2 3 4 5 6 7 8 9 10 11 12 0 Objective Function Total Costa Total Revenue Profil