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Question 1 Stony Electronics Corporation manufactures a portable radio designed for mounting on the wall of the bathroom. The company incurred the following costs during the month of September. a. The plant manager's salary. b. The cost of heating the plant. e. Salaries and commissions of company salespersons. f. Depreciation on office equipment used in the executive offices. g. Wages of janitorial personnel who clean the plant. c. The cost of heating executive offices. d. The cost of printed circuit boards used in the radios. Required: Complete the following matrix by placing an X mark under the appropriate headings. More than one answer may apply + for each cost item. Direct Direct Manufacturing Period Fixed Variable Cost Item Materials Labour Overhead Costs Cost Costs a. b. c. d. e. f