2. PRICING IN BINOMIAL TREE MODEL (20 POINTs) Consider three-period binomial tree model for the stock price S with the following param- eters: So = $100, u = 1.2, d = 0.9. Find the no-arbitrage present value of the (European) butterity option with the following payof function 0, S [100, 140]. A(S)140-S, S[120, 140 S- 100, S E [100, 120) Assume that r = 0.1