You buy a call option and sell a put option on shares of ABC stock. Both options are European, have an exercise price of $70, expire in 90 days, and are priced at $4.50. You also invest the present value of the exercise price, at an interest rate (annualized) of 10%.

1. Draw the payoff diagram for your portfolio (on the expiration date). Remember to include the payoffs to the call and put as well as the investment proceeds.
2. [Challenging question] What is the current stock price? Why?