During the year, the company produced 10,000 units and sold 5,000 units. The selling price of the company's product is $20 per unit. a) Assume that the company uses absorption costing. Compute the product cost per unit. b) Assume that the company uses absorption costing. Prepare an income statement for the year. c) Assume that the company uses variable costing. Compute the product cost per unit. d) Assume that the company uses variable costing. Prepare an income statement for the year