$G$ is employed by a Canadian$-$controlled private corporation. In year $1,G$ was granted a stock option to acquire $1,000$ shares from the treasury of his employer's corporation for $$8$ a share. At the time of receiving the option, the shares were valued at $$10$ per share. In year $3,$ G exercised his option and purchased $1,000$ shares for $$8,000.$ At the purchase date in year $3,$ the shares were valued at $$15$ per share. In year $6,G$ sold $1,000$ shares for $$20$ per share. What amount is included in G$\text{'}$s employment income for tax purposes in year $6?$