Let E1, E2, and E3 represent the ending inventory for the three months respectively. Let RT1, RT2, and RT3 represent the regular production for the three months and OT1, OT2, and OT3 represent the overtime production quantities during the three months respectively. What is the optimal production schedule to produce dishwashers each month during regular production and to use overtime to produce 10 units in July and 5 in August?