1.A company's financial year runs from January to December. The following is a series of events concerning the company's stock:

1 January - the company had 10,000,000 shares outstanding

1 April - the company issued a 10% stock dividend

31 August - 2,400,000 new shares were issued

1 December - 30% of the shares in existence at this time were bought back

Estimate the number of shares that should be used to calculate basic earnings per share.