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The Casual Furniture Company manufactures outdoor furniture, and incurred the following costs during the month of January. Timber $25 000 Paint $5 000 Glue (insignificant amount to trace) $500 Wages-assembly personnel $20 000 Wages-factory supervisor $3 500 Factory cleaner's wages $2 000 Sales commissions $10 000 Administrative staff salaries $4 000 Depreciation-factory equipment $3 000 Depreciation-sales office equipment $1 000 Utilities, insurance-factory $6 000 Utilities, insurance-sales office $2 000 Advertising $8 000 Total costs $90 000 The prime costs are: O $30 000 $50 000 $65 000 $50 500