29. Which of the following is automobiles? ot an example of an indirect cost incurred in manufacturing A. B. C. D. plant supervisor salary machinery depreciation in the factory plant utilities cost of the automobile engines 30. Wh en manufacturing products, direct labor and direct materials are classified as A. B. C. D. The salary paid to the maintenance supervisor in a manufacturing plant is an example of a period costs and expensed when incurred. product costs and expensed when the goods are sold. product costs and expensed when incurred. period costs and expensed when the goods are sold. 31. Product CostManufacturing Overhead A)|No B) Yes C) Yes Yes No Yes No D) No A. Option A B. Option B C. Option C D. Option D Plowin' Supply plans to make 15,000 tractors at its plant. Fixed costs are $600,000 and variable costs are $200 per tractor. What is the average total cost per tractor? 32. A. $40 B. $60 C. $200 D. $240