On January 1, 2020, Sunland Manufacturers had 342,000 common shares outstanding. On April 1, the corporation issued 34,200 new common shares to raise additional capital. On July 1, the corporation declared and distributed a 10% stock dividend on its common shares. On November 1, the corporation repurchased on the market 9,900 of its own outstanding common shares to make them available for issuances related to its key executives outstanding stock options.

a) Calculate the weighted average number of shares outstanding as at December 31, 2020

b) Assume that Sunland Manufacturers had a 1-for-10 reverse stock split instead of a 10% stock dividend on July 1, 2020. Calculate the weighted average number of shares outstanding as at December 31, 2020.