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Answer questions \#10- \#15 based on the following information. We have a two-state, two-period world (i.e. there are time periods t=0,1,2 ). The current stock price is 100 and the risk-free rate each period is 5%. Each period the stock price can either go up by 10% or down by 10%. A European call option on this stock with an exercise price of 90 expires at the end of the second period. 10. The current price of the call is about a. 16.68 b. 17.42 c. 18.89 d. 19.22 e. 20.01