On January 1, 2014, Leonard Corporation purchased 1,000 shares of treasury stock. Other information regarding Leonard Corporation is provided below.

2013 2014 Net income $200,000 $210,000 Dividends on preferred stock $30,000 $30,000 Dividends on common stock $20,000 $25,000 Weighted-average number of common shares outstanding 10,000 9,000 Common stockholders’ equity beginning of year $600,000 $760,000 Common stockholders’ equity end of year $760,000 $830,000 Compute

(a) return on common stockholders’ equity for each year and

(b) discuss the changes in each.