Exercise 18-6 Classifying product and period costs C2 A car manufacturer incurs the following costs. Classify each cost as either a product or period cost. If a product cost, classify it as direct materials, direct labor, or factory overhead. If a period cost, classify it as a selling expense or a general and administrative expense. Place an "X" in the correct column for each cost. Cost 1. Factory electricity... 2. Advertising 3. Depreciation on factory machine.. 4. Batteries for electric cars. 5. Office supplies used. 6. Wages to assembly workers.. 7. Salesperson commissions 8. Steel for cars. 9. Depreciation on office equipment. 10. Leather for car seats... Product Costs Period Costs Direct Direct Materials Labor Factory Overhead Selling Expense General and Administrative Expense