Using the information in Problem 13.3, develop plan B. Produce at a constant rate of 1,400 units per month, whuch will meet minimum demands. Then use subcontracting, with addi- tional units at a premium price of $75 per unit. Evaluate this plan by computing the costs for January through August pc 13.3 The president of Hill Enterprises. Terri Hill. projects the firm's aggregate demand requirements over the next 8 months as follows Jan Feb Mar Apr 1,400 1,600 1,800 1,800 May June July Aug 2.200 2.200 1,800 1,800