Sandhill Inc uses a calendar year for financial reporting. The company is authorized to issue 8,490,000 shares of $10 par common stock. At no time has Sandhill issued any potentially dilutive securities. Listed below is a summary of Sandhill's common stock activities 1 2 Number of common shares issued and outstanding at December 31, 2018 Shares issued as a result of a 10% stock dividend on September 30, 2019 Shares issued for cash on March 31, 2020 Number of common shares issued and outstanding at December 31, 2020 A 2-for-1 stock split of Sandhill's common stock took place on March 31, 2021 2,170,000 217.000 1,850,000 3. 4,237,000 4 Compute the weighted average number of common shares used in computing earnings per common share for 2020 on the 2020 comparative income statement. shares