3) (15 pts) You can do this problem in Excel The fixed strike (also known as an average rate) Asian call option with the strike K has the payoff defined as max(A - K, 0), where A is the average observed price of the underlying asset from the time the option is issued up to the time of exercise. Use the 3-step binomial tree to price the fixed strike Asian call option of the American exercise type. Assume that the spot price is $50. The time to maturity T is 3 months. Risk-free rate is 0.1 with continuous compounding, u = 1.2, d = 0.9