You own a put option with strike price equal 50 and a call option with strike price equal to 30. Both options have the same stock as underlying and the same maturity date. Suppose that you have also borrowed at the time of the purchase of the options an amount equal to the present value of the strike price of the call option and you have to return this loan at the maturity date of the options. The current price of the stock is 50. What will be the total payoff of all these investments at maturity (including the loan) if the price of the stock at that point is equal to 100?