Weighted-Average Shares Outstanding

On January 1, 2020, Lincoln Company had 600,000 shares of $10 par common stock outstanding. During 2020, Lincoln had the following transactions that affected the common stock account. March 1 Issued 100,000 shares May 1 Issued a 20% stock dividend July 1 Acquired 60,000 shares of treasury stock September 1 Reissued 40,000 shares of treasury stock November 1 Issued a 2-for1 stock split Instructions: Compute the weighted-average number of common stock shares outstanding as of December 31, 2020.