Ivanhoe Inc. uses a calendar year for financial reporting. The company is authorized to issue 9,840,000 shares of $12 par common stock. At no time has Ivanhoe issued any potentially dilutive securities. Listed below is a summary of Ivanhoes common stock activities.

1.		Number of common shares issued and outstanding at December 31, 2018		2,090,000
2.		Shares issued as a result of a 12% stock dividend on September 30, 2019		250,800
3.		Shares issued for cash on March 31, 2020		1,940,000
		Number of common shares issued and outstanding at December 31, 2020		4,280,800
4.		A 2-for-1 stock split of Ivanhoes 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 2013 on the 2014 comparative income statement

b) Compute the weighted-average number of common shares used in computing earnings per common share for 2014 on the 2014 comparative income statement

c) Compute the weighted-average number of common shares to be used in computing earnings per common share for 2014 on the 2015 comparative income statement.

d) Compute the weighted-average number of common shares to be used in computing earnings per common share for 2015 on the 2015 comparative income statement.