ABC Wash, Inc., makes commercial and industrial laundry machines (the kinds hotels use), and has these aggregate demand requirements for the next six months. The firm has regular capacity for 200 units, and overtime capacity of 40 units. Currently, subcontracting can supply up to 100 units per month, but the subcontracting firm may soon be unavailable. Demand for Month M1 is 220, M2 is 180, M3 is 210, M4 is 190, M5 is 230, and M6 is 205. Previous output level is 170 units and the beginning inventory is 70 units. $250 per unit per Back-Ordering cost month Inventory holding $100 per unit at end cost of month Regular time cost $1,200 per unit Subcontracting cost $2,000 per unit Overtime cost $1,500 per unit Cost of increasing $200 per unit units (hiring) Cost of decreasing $500 per unit units (layoff) a. Produce utilizing a level strategy at 180 units in which the company incurs regular time production costs, inventory charges and any costs due to the change in the production level from the previous output level. What is the cost of this strategy? [Select] b. Was there a need to back-order? If so, how many units? [Select] c. Produce utilizing a mixed strategy by producing 160 units every month. Then, utilize overtime, and subcontracting to meet demand. (Don't forget the capacity limitations on overtime and subcontracting.) What is the cost of this strategy? [Select] d. Based on the mixed strategy, what was the cost of utilizing overtime [Select]