Ram Roy's firm has developed the following supply, demand, cost, and inventory data. Supply Available Regular Demand Period Time Overtime Subcontract Forecast 123 40 30 40 1555 10 40 10 55 10 55 Initial inventory 20 units Regular-time cost per unit Overtime cost per unit $100 $160 Subcontract cost per unit $200 Carrying cost per unit per month $4 Assume that the initial inventory has no holding cost in the first period and backorders are not permitted. Allocating production capacity to meet demand at a minimum cost using the transportation method, the total cost is $13500 (enter your response as a whole number).