4.14. To compute prices of a 6-month American call option, future prices of the underlying stock are modeled with a 2-period binomial tree with 3 month periods. You are given: (i) In each period, the price of the stock are either multiplied by 1.1 or multiplied by 0.9. (ii) The initial stock price is 40 . (iii) The stock pays continuous dividends proportional to its price. The dividend yield is 0.03. (iv) The continuously compounded risk-free interest rate is 0.05. Determine the least upper bound of strike prices for which early exercise is optimal. 4.14. To compute prices of a 6-month American call option, future prices of the underlying stock are modeled with a 2-period binomial tree with 3 month periods. You are given: (i) In each period, the price of the stock are either multiplied by 1.1 or multiplied by 0.9. (ii) The initial stock price is 40 . (iii) The stock pays continuous dividends proportional to its price. The dividend yield is 0.03. (iv) The continuously compounded risk-free interest rate is 0.05. Determine the least upper bound of strike prices for which early exercise is optimal