On January 1, 2010, Sienna Corporation purchased 2,000 shares of treasury stock. Other information regarding Siena Corporation is provided below.

2009

2010

Net income

$110,000

$110,000

Dividends on preferred stock

$10,000

$10,000

Dividends on common stock

$2,000

$1,600

Weighted average number of shares outstanding

10,000

8,000*

Common stockholders’ equity, beginning of year

$500,000

$400,000*

Common stockholders’ equity, end of year

$500,000

$400,000

Adjusted for purchase of treasury stock.

Compute (a) return on common stockholders’ equity for each year and (b) earnings per share for each year, and (c) discuss the changes in each.