问题如下：
Wilson Flannery is concerned that this project has multiple IRRs.
How many discount rates produce a zero NPV for this project?
选项：
A.One, a discount rate of 0 percent.
B.Two, discount rates of 0 percent and 32 percent.
C.Two, discount rates of 0 percent and 62 percent.
解释：
C is correct.
Discount rates of 0 percent and approximately 61.8 percent both give a zero NPV.
带入0.62 npv=0.302
带入0.32 npv=0.158
这没法判断啊
