The following information is available for Barone Corporation:

January 1, 2015 Shares outstanding 2,000,000

April 1, 2015 Shares issued 320,000

July 1, 2015 Treasury shares purchased 120,000

October 1, 2015 Shares issued in a 100% stock dividend 2,200,000

The number of shares to be used in computing earnings per common share for 2015 is

a. 4,520,800.

b. 4,380,000.

c. 4,360,000. - I know this is the correct answer but how do I calculate this?

d. 2,730,000.