Accounts Receivable 5,000 Advertising Expense 1,600 Cash 500 Cost of Goods Sold 6,000 Inventory 3,000 Property, Plant, and Equipment 12,000 Research Expense 1,900 Sales 20,000 Total Equity 7,500 Total Liabilities 13,000 Wage Expense 10,000 Compute Return on Sales. Select one: a. 3.5% b. 7.9% c. 3.1% d. 2.3% e. 2.0% f. 2.5% g. 6.7% h. 5.3%