Sutherland manufactures and sells 60,000 laser printers each month. A principal component part in each printer is its paper feed drive. Sutherlands plant currently has the monthly capacity to produce 80,000 drives. The unit costs of manufacturing these drives (up to 80,000 per month) are as follows. Variable costs per unit: Direct materials $ 25 Direct labor 20 Variable manufacturing overhead 5 Fixed costs per month: Fixed manufacturing overhead $ 600,000 Desk-Mate Printers has offered to buy 15,000 paper feed drives from Sutherland to be used in its own printers. a. Compute the average unit cost of manufacturing each paper feed drive assuming that Sutherland manufactures only enough drives for its own laser printers. b. Compute the incremental unit cost of producing an additional paper feed drive. c. Compute the per-unit sales price that Sutherland should charge Desk-Mate to earn $150,000 in monthly pretax profit on the sale of drives to Desk-Mate.