Consider the following two strategies: Strategy A: Long a call option with X1 = $20; write two call options, each with X2 = $30; and long a call option with X3 = $40 Strategy B: Long a put option with X1 = $20; write two put options, each with X2 = $30; and long a put option with X3 = $40 All the options have the same maturity and they are used on the same stock. Further assume that the firm pays no dividend. Required: Use ONLY the put-call parity to prove that both strategies A and B have the same cost. You are NOT allowed to use any other methods such as drawing terminal payoff diagram, or setting up terminal payoff table as your proof. Consider the following two strategies: Strategy A: Long a call option with X1 = $20; write two call options, each with X2 = $30; and long a call option with X3 = $40 Strategy B: Long a put option with X1 = $20; write two put options, each with X2 = $30; and long a put option with X3 = $40 All the options have the same maturity and they are used on the same stock. Further assume that the firm pays no dividend. Required: Use ONLY the put-call parity to prove that both strategies A and B have the same cost. You are NOT allowed to use any other methods such as drawing terminal payoff diagram, or setting up terminal payoff table as your proof