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31. A put option sells for $18. It has a strike price of $80 and 18 months until expiration. If the underlying stock sells $60 per share, what is the price of a call option with an $80 strike price and 18 months until expiration? The risk free interest rate is 6% per year. A) $4.70 B) $9.25 C)$13.80 D) $18.50 E) $25.70