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. Costs Wages to assembly workers Salesperson commissions Cost Classification Steel for cars Depreciation on office equipment Leather for car seats Property taxes on factory building Factory water usage Salesperson travel costs Wages to paint machine operators Advertising Period Cost: General & Administrative Expense Period Cost: Selling Expense Product Cost: Direct Labor Product Cost: Direct Materials