A look back option is a call option that allows the holder to buy the stock at the minimum stock price that occurred over the period to expiration. Suppose, S$0=$ $$129,$ U $=1\mathrm{.}5,$ D $=0\mathrm{.}5,$ and R $=1\mathrm{.}1,$ use a $3-$period binomial model and find the price of such a contract? Could I see this done in excel?