A company reports the following: Net income $155,000 Preferred dividends 6,200 Average stockholders' equity 1,291,667 Average common stockholders' equity 800,000 Determine (a) the the return on stockholders equity and (b) the return on common stockholders equity. If required, round your percentages to one decimal place. a. The rate earned on stockholders' equity % b. The rate earned on common stockholders' equity %