The Sharpe Company reports the following information for 2012: Sales $76,500 Direct materials used 7,300 Depreciation on factory equipment 4,700 Indirect labor 5,900 Direct labor 10,500 Factory rent 4,200 Factory utilities 1,200 Sales salaries expense 15,600 Office salaries expense 8,900 Indirect materials 1,200 Compute: a) product costs b) period costs