Please provide detailed explanation , where do you get each number used for every calculation.

The following information is available for Barone Corporation: January 1, 2018 Shares outstanding 4,000,000 April 1, 2018 Shares issued 640,000 July 1, 2018 Treasury shares purchased 240,000 October 1, 2018 Shares issued in a 100% stock dividend 4,400,000 The number of shares to be used in computing earnings per common share for 2018 is a. 9,041,600 b. 8,760,000. c. 8,720,000. d. 5,460,000