4. Consider a stock with current price So $80. The value of the stock at time t : 1 can take one of two values: S1,2 = $120, S1,d = $50. The price of a risk-free bond that pays out $1 in period t = 1 is $0.95. = a (a) Using a one step binomial tree, write down the possible payoffs of a put option on stock S with strike K = $60 and maturity t= 1. (b) What is the price of this put option? HINT: this calculation is very similar to what we did for a call option in the lecture notes. (c) What is the price of a call option with strike K $60 and maturity t 1? HINT: you can use put-call parity to find the call price. a =