Answer:
a. Net income for 2021 $1,600,000
Less: Preferred dividends $120,000 (40000*$3)
Net income for Common Stockholders $1,480,000
Divide by Common Shares outstanding 600,000
Basic Earnings per share for 2021 $2.47
b. If company's preferred stock were convertible into common stock, diluted earnings per shares will also have to be calculated.