13A-13. Can someone show me how to do this problem?

Will rate a thumb up for good response thanks so much (PLEASE CIRCLE OR HIGHLIGHT final answer thx)

Ram Roy's firm has developed the following supply, demand, cost, and inventory data. Supply Available Regular Time Demand Forecast Period Overtime Subcontract 1 30 35 40 2 3 15 15 20 5 5 5 40 50 60 Initial inventory Regular-time cost per unit Overtime cost per unit Subcontract cost per unit Carrying cost per unit per month 20 units $100 $160 $250 $2 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 $ (enter your response as a whole number)