5. On January 1, 2018, Martin Corp. had 300,000 shares of common stock outstanding. During 2018, it had the following transactions that affected the common stock account (4 Marks) February 1 Issued 120,000 Shares April 1 Issued a 10% stock dividend May 1 Acquired 100,000 share of treasury stock June 1 Issued a 2-for-1 stock split October 1 Reissued 60,000 shares of treasury stock Determine the weighted-average number of shares outstanding as of December 31, 2018