NO.PZ2020021205000011
问题如下：
A stock price is currently 50. Its volatility is 20% per annum. The risk-free rate is 4% per annum with continuous compounding. Use a two-step tree to determine the value of a six-month European call option on the stock with a strike price of 48.
选项：
解释：
In this case, u = 1.1052, d = 0.9048, and p = 0.5252.
The following two-step tree shows that the value of the
option is 4.511.
请老师帮忙解释一下，或者我应该去第几节看这个知识点呀
