Please make the response detailed and easy to read, thanks

Computing Weighted-Average Common Shares On January 1, 2020, Case Inc., had 300,000 shares of common stock issued and outstanding. Case issued a 10% stock dividend on July 1, 2020. On October 1, 2020, Case purchased 24,000 shares of its common stock for the treasury. What is the number of shares that should be used in computing basic earnings per share for the year ended December 31, 2020? 0