The following information is available for Ritter Corporation: 2011 2010 Average ordinary shareholders’ equity $1,500,000 $1,000,000 Average total shareholders’ equity 2,000,000 1,500,000 Ordinary dividends declared and paid 72,000 50,000 Preference dividends declared and paid 30,000 30,000 Net income 330,000 270,000 Enquired Compute the return on ordinary shareholders’ equity ratio for 2011. (百分数取整数,例如28%)