Following is financial statement information for Rogex Corporation: cash - $242, accounts receivable - $850; inventory = $820; net fixed assets $3,408; accounts payable = $700; short-term notes payable = $740; long-term liabilities = $1,100; common stock = $1,160; retained earings = $1,620, net sales = $2,768, cost of goods sold = $1.210; depreciation = $360: Interest expense - $160, taxes - $312, addition to retained earnings = $508; and dividends paid = $218. What is Rogex's retum on total assets? O a. 37.9% O b. 13.6% OC 19.1% d. 9.6%