During 2011, Crockett, Inc.'s net income was $100,000. Its common stockholders' equity was $700,000 at January 1, 2011 and $800,000 at December 31, 2011. During December, 2011, Crockett's board of directors declared a $25,000 preferred stock dividend and a $60,000 common stock dividend. What is Crockett's 2011 return on common stockholders' equity?