Lansing, Inc., had 840,000 shares of common stock issued and outstanding at December 31, 2020. On July 1, 2021, an additional 20,000 shares of common stock were issued for cash. Lansing also had unexercised stock options to purchase 32,000 shares of common stock at $15 per share outstanding at the beginning and end of 2021 . The average market price of Lansing's common stock was $20 during 2021. What is the number of shares that should be used in computing diluted earnings per share for the year ended December 31,2021