Question: = 4. (20 pts) In a binomial tree model, let S(0) $100, u = 0.25, d = - -0.2, r = 0.1. Find today's price

= 4. (20 pts) In a binomial tree model, let S(0) $100, u = 0.25, d = - -0.2, r = 0.1. Find today's price of an American put with strike price $90 expiring after two steps. When should the American put be exercised early
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