Basically, the market value of a share is $3 The share option lets you buy shares 2 million shares at $1.20 which is a total of $2.4million. $2.4million divided by the market value of $3 means 800,000 shares could’ve been bought at the market price for the total value of the option. Therefore the dilution element is the difference between 2 million and 800,000, i.e. 1,200,000 shares. so retained earnings/shares is 1550/5000(original equity) + 1200 = 0.25