need help with part c

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You are attempting to value a put option with an exercise price of $100 and one year to expiration. The underlying stock pays no dividends, its current price is $100, and you belleve it has a 50% chance of increasing to $120 and a 50% chance of decreasing to $80. The risk-free rate of interest is 10%. a. What will be the payoff to the put, Pu, if the stock goes up? Answer is complete and correct. Payoff b. What will be the payoff, Pd if the stock price falls? b. What will be the payoff, Po if the stock price falls? Answer is complete and correct. Payoff c. What is the weighted average value of the pay off? (Do not round intermediate calculations. Round your answer to 3 decimal places.) Answer is complete but not entirely correct