Ivanhoe Inc. uses a calendar year for financial reporting. The company is authorized to Issue 8, 610,000 shares of $10 par common stock. At no time has Ivanhoe Issued any potentially dilutive securities. Listed below is a summary of Ivanhoe's common stock activities. Compute the weighted-average number of common shares used in computing earnings per common share for 2016 on the 2017 comparative income statement. Compute the weighted-average number of common shares used in computing earnings per common share for 2017 on the 2017 comparative income statement. Compute the weighted average number of common shares to be used in computing earnings per common share for 2017 on the 2018 comparative income statement. Compute the weighted-average number of common shares to be used in computing earnings per common share for 2018 on the 2018 comparative income statement