Suppose S = $100, K = $95, r = 8% (continuously compounded), t = 1, o = 30%, and o = 5%. Use an eight-period lognormal binomial tree to answer the following questions. You can also use Excel for this question. If you do so, please upload the Excel file separately with the |3D detailed calculations. (a) Construct the stock tree. (b) Compute the prices of an European call option. (c) Compute the prices of an American put option.