Marin Inc. uses a calendar year for financial reporting. The company is authorized to issue 9,100,000 shares of $10 par common stock. At no time has Marin issued any potentially dilutive securities. Listed below is a summary of Marins common stock activities.

1.		Number of common shares issued and outstanding at December 31, 2018		2,200,000
2.		Shares issued as a result of a 10% stock dividend on September 30, 2019		220,000
3.		Shares issued for cash on March 31, 2020		2,040,000
		Number of common shares issued and outstanding at December 31, 2020		4,460,000
4.		A 2-for-1 stock split of Marins common stock took place on March 31, 2021

Compute the weighted-average number of common shares to be used in computing earnings per common share for 2020 on the 2021 comparative income statement.