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Determine the two possible stock prices at expiration

Problem 1) Consider a stock currently selling for $80. It can go up or down by 15% per period. The risk-free rate is 6%. Use a one period binomial model. You want to price a European call option with exercise price of $84.

a. Determine the two possible stock prices at expiration.

b. Construct two portfolios with equivalent payoffs. One portfolio using a call the other the stock and a t-bill.

c. What is the value of the portfolios at expiration?

d. Compute the value of the call.

Problem 2) In problem 1 assume you find that the actual market price of the call is $6. What arbitrage position should you take? Compute the profit you will earn from the position.

Problem 3) Assume that you want to price a one year American put option. The underlying stock is selling for $40 and the option has a strike price of $40. Standard deviation is 30% and the risk free rate is 6%. Use a one period binomial model.

a. Compute u and d using the formulas on page 322.

b. Compute p

c. Compute the value of the option.

Problem 4) Using the information from number 3 price a one year American call option with an exercise price of $40 using a two-period binomial model.

Problem 5) Using the same information as in number 4 price a one year American put option with exercise price of $40 using a two-period binomial model. Verify that put/call parity holds.

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