Return on Stock Options. Chris purchased a call option on a stock for $473. The option gives him the right to purchase the stock at $28.73 per share until May 1st. On May 1st, the price of the stock is $28.21 per share. What is Chris' return on the stock option? (Hint: Ignore transaction costs.) Chris' return on the stock option is % (Round to the nearest whole percent and include a negative sign when appropriate.)