21. The difference between variable costing and absorption costing is in: a. Variable manufacturing costs b. Fixed manufacturing costs c. Fixed sales and administrative costs d. The sum of b and c

22. Operating income calculated using variable costing is equal to operating income calculated using full costing when: a. The company has no inventories b. The beginning and ending inventory contain the same amount of costs c. The company has no fixed costs. d. a and c are correct.

23. The cost of maintaining the manufacturing equipment is a cost of: a. Prevention b. Evaluation c. Internal failure d. External failure

24. The cost of training manufacturing employees is a cost of: a. Prevention b. Evaluation c. Internal failure d. External failure

25. The cost incurred in selecting the best raw material suppliers is a cost of: a. Prevention b. Evaluation c. Internal failure d. External failure