You are given the following information for a European call option

Call price = $7

Present value of the strike price = 18

Current price of the underlying stock = $20

What must be the value of a European put option with the same strike price, time to expiration, and underlying stock as the call option?

You are valuing a call option on a stock using the binomial model. The riskless portfolio contains 0.5 shares of stock. is $7.40. What is the value of the call option?