NO.PZ2018062005000002
问题如下：
Amy, the financial analyst in the investment bank, predicted the expected cash flows of a project in Alpha Cop. for next four years.
Assume the initial investment in this project is $50,000, and the required return is 10%. The discounted payback period of the project is:
选项：
A.3.07 years
B.3.23 years
C.3.93 years
解释：
C is correct. The discounted payback period falls between 3 and 4 years. It can be calculated as 3+(50,000-37,284)/13,660.27=3.93 years.
这道题的计算过程：
先将现金流累积，发现是3年到4年间符号变化由负转正
第3年现金流18000，第4年现金流20000
因此3+18000/20000=3.90
选最近的3.93
这样可以么？
