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Use the Black-Scholes formula to value the following options: a. A call option written on a stock selling for $63 per share with a $63 exercise price. The stock's standard deviation is 9% per month. The option matures in three months. The risk-free interest rate is 1.75% per month. (Do not round intermediate calculations. Round your answer to 2 decimal places.) b. A put option written on the same stock ot the same time, with the same exercise price and expiration date, (Do not round Intermediate calculations. Round your answer to 2 decimal places.)