You construct a portfolio consisting of the following instruments: 1 share of a non-dividend paying stock with a current price of 63. 4 long calls on the stock with a strike price of 65 and 3 months to maturity. The price of each call is 3.70. 5 short calls on the stock with a strike price of 68 and 3 months to maturity. The price of each call is 2.20. You borrow enough money today (short bond) so that your total portfolio cost is 25.00. The continuously compounded risk free rate is 1.9%. Determine: a. The breakeven stock price(s). b. The maximum profit. c. The profit if the ending stock price is 50.