Use risk-neutral valuation to calculate the probabilities in the model that will give you the correct call prices in the following question:

A stock price is $50 now. In one month it can go 10% up or down. In the second month it can go 10% up or down. The annual interest rate is 10% with continuous compounding. Use risk- free portfolios to determine the value of: a) A two-month European call with strike price 50 b) A two-month European call with strike price 52