NO.PZ2023091802000131
问题如下：
An analyst is pricing a 2-year European put option on anon-dividend-paying stock using a binomial tree with two time steps of one yeareach. The stock price is currently USD 38, and the strike price of the put isUSD 40. What is the value of the put closest to, assuming that the annualrisk-free rate will remain constant at 2% over the next two years and theannual stock volatility is 15%
选项：
A.
USD 3.04
B.
USD 3.48
C.
USD 3.62
D.
USD 3.81
这里的 0，2，11.9 分别怎么算出来的，还有 P0=3.48 怎么得来的，这个解答过程和上面一个回答的过程不太一样啊
