Consider a 3-year American call option on a non-dividend- paying stock. The call's strike price is $320. The stock currently sells for $350, and the price moves either up or down by 15% in each step. The risk-free rate is 2% per annum. What is the price of the American call? Use a three-step binomial tree. $49.00 $53.54 $65.41 $72.31 Consider a stock whose future price is log-normally distributed. The required rate of return on the stock in the real world is 15% per annum, and its volatility is 20%. The current stock price is $100. The risk-free interest rate is 5% per annum. What is the real probability that the future stock price in year 3 is greater han $150? 0.084 0.181 O 0.482 0.518