NO.PZ2023100703000097
问题如下：
A risk analyst constructs a binomial interest rate tree by using the Ho-Lee model. The time step is monthly, and the annualized drift is 60 bps in the first month and 130 bps in the second month. Assuming the current annualized short-term rate is 2.7% and the annual basis point-volatility is 1.9%, what is the interest rate in the lowest node after 2 months?选项：
A.0.0144 B.0.0176 C.0.0231 D.0.0254解释：
The interest rate in the lowest node based on the Ho-Lee model is:
讲义里有很多个模型及公式，哪些是需要记的
