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2b. We consider a stock with current price S(0) = $62. The value at time t=0 of several European and American options with different strikes

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2b. We consider a stock with current price S(0) = $62. The value at time t=0 of several European and American options with different strikes and maturity T = 2 years are given below: 100 120 Strike Price 40 European Call Price 24 European Put Price 2 6 3 8 20 Strike Price 40 American Call Price 24 American Put Price 3 120 10 21 Question 1 (8pts): Assume no dividend payments and r= 0. Construct an arbitrage opportunity using the put-call parity relation for European options with strike price K = $100. Show that it indeed leads to an arbitrage. Question 2 (8pts): Assume no dividend payments and r > 0. Prove that there is no value X leading to an arbitrage opportunity in a portfolio made of: long one call with strike price K = $40; short 4 calls with strike price K = $100; lend $3; and short X calls with strike price K = $120. Question 3 (7pts): Assume no dividend payments and r = 0. Compute the best lower bound available for the price of an American call option with strike price K = $55. Question 4 (7pts): Assume a dividend payment with present value D = 7 and r = 0. Compute a lower bound for a portfolio made of: a long call with strike price K = $55 and a short put with strike price K = = $55

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