uestions 1-8 should be answered by building a 15-period binomial model whose parameters should be calibrated to a Black-Scholes geometric Brownian motion model with: T=.25 years, S0=100, r=2%, σ=30%
and a dividend yield of c=1%. u=1.0395.... (This has been rounded to four decimal places but you should not do any rounding in your spreadsheet calculations）

问题：Compute the price of an American call ／put option with strike K=110 and maturity T=.25 years.