In 2015, Aidan was given options to buy 859 shares of Monopolys stock at a price of $29.43 per share. At the time the options were issued, the shares were trading at $29.43 per share. On June 1, 2020, Aidan exercised some of his options and purchased 519 shares. At the time of exercise, the shares were trading at $37.51 per share. He is still holding the shares on December 31, 2020. Required: Calculate the stock option benefit that Aidan should include in his employment income. Show calculations to support your answer.