Ayayai Inc. uses a calendar year for financial reporting. The company is authorized to issue 8,210,000 shares of $12 par common stock. At no time has Ayayai issued any potentially dilutive securities. Listed below is a summary of Ayayai's common stock activities. 1. Number of common shares issued and outstanding at December 31, 2018 1,890,000 2. Shares issued as a result of a 12% stock dividend on September 30, 2019 226,800 3. Shares issued for cash on March 31, 2020 2,100,000 Number of common shares issued and outstanding at December 31, 2020 4,216,800 4. A 2-for-1 stock split of Ayayai's common stock took place on March 31, 2021 (a) Compute the weighted-average number of common shares used in computing earnings per common share for 2019 on the 2020 comparative income statement. shares