Ivanhoe Inc is publicly traded and uses a calendar year for financial reporting. The company is authorized to issue 50 million common shares. At no time has Ivanhoe issued any potentially dilutive securities. The following is a summary of Ivanhoe's common share activities: 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 6,180,000 618,000 2,660,000 9.458,000 Ivanhoe issued its 2020 financial statements on February 28, 2021. A 2-for-1 stock split of Ivanhoe's common shares occurred on March 31, 2021. Calculate the weighted average number of common shares to use in calculating earnings per common share for 2019 on the 2019 comparative income statement. shares Weighted average number of common shares eTextbook and Media Calculate the weighted average number of common shares to use in calculating earnings per common share for 2019 on the 2020 comparative income statement. shares Weighted average number of common shares: Calculate the weighted average number of common shares to use in calculating earnings per common share for 2020 on the 2020 comparative income statement. shares Weighted average number of common shares e Textbook and Media Calculate the weighted average number of common shares to use in calculating earnings per common share for 2020 on the 2021 comparative income statement. shares Weighted average number of common shares Calculate the weighted average number of common shares to use in calculating earnings per common share for 2021 on the 2021 comparative income statement shares Weighted average number of common shares e Textbook and Media