A trader has an American put option with strike price of $50. The underlying asset is stock with a spot price of $40. Using an one-step binomial tree to *uate the option. Suppose the stock price will go up or down by $8 in 6 month, the risk-free rate is 6.2, what is the value of this American put?
　　A. USD 8.19
　　B. USD 8.45
　　C. USD 10.00
　　D. USD 10.32
答案：C
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