Selected current year company information follows:

Net income .... i....... . $ 325,000 Net sales ......... . . . . ............. 4,700,000 Total liabilities, beginning-year............. 550,000 Total liabilities, end-of-year......... 530,000 Total stockholders' equity, beginning-year. 760,000 Total stockholders' equity, end-of-year....... 745,000 Calculate the following company ratios: (a) Profit margin. (b) Total asset turnover. (c) Return on total assets. (d) Return on common stockholders' equity (assume the company has no preferred stock)