8. Return on investment (ROI) is the result of multiplying: Profit by average operating assets. b. Profit Margin by asset turnover. Return on assets (ROA) by asset turnover. d. Profit Margin by return on assets (ROA). C. 17. "Committed" and "Sunk" costs are: a. Generally not fixed. b. Generally small in amount. C. Apply to future decisions. d. Not relevant for decision-making. 19. Manufacturing firms use which of the following three inventory accounts? a. Materials, Work-in-process, Transferred-out. b. Materials, Finished goods, Transferred-out. Materials, Work-in-process, Finished goods. d. Work-in-process, Finished goods, Transferred-out. c. 22. Contribution margin is defined as sales less: a. Direct labor costs. b. Direct material costs. c. Variable costs. d. Cost of Goods Sold