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This answer does not take into account the 2-for-1 stock split that occurred in 2010.
This answer assumes that the shares issued in the stock split were outstanding for six months. However, shares issued in a stock split or as a stock dividend are considered to have been outstanding from January 1 of the first year presented.
This answer assumes that the shares issued in the stock split were outstanding for nine months. However, shares issued in a stock split or as a stock dividend are considered to have been outstanding from January 1 of the first year presented.
At the beginning of 2010 there were 2,100,000 shares outstanding. In 2010, there was a 2-for-1 stock split and the shares that were issued as part of the stock split are considered to have been outstanding for the entire year. Therefore, the 2010 weighted-average shares outstanding on the 2010 comparative income statement is 4,200,000.