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A share of stock is currently worth $90 and has a volatility of20%. The domestic risk-free interest rate is 5% and the stock doesnot pay any dividend. Use a two-step binomial tree to derive a) thevalue of a European four-month call option written on a 100 sharesof stock with a strike price of $91 per share, and b) the positionin shares of stock (long or short) which will hedge a shortposition in the European call option today.
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