Motorola Credit Corporation's annual report: Net revenue (sales) Net earnings Total assets Total liabilities Total stockholders' equity (dollars in millions) $ 307 168 2,225 1,915 310 a. Find the total debt to total assets ratio. (Round your answer to the nearest hundredth percent.) Total debt to total assets % b. Find the return on equity ratio. (Round your answer to the nearest hundredth percent.) Return on equity % c. Find the asset turnover ratio. (Round your answer to the nearest cent.) Asset turnover d. Find the profit margin ratio on net sales. (Round your answer to the nearest hundredth percent.) Profit margin %