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.
请教助教老师，本题已经说了是multiple IRR了，但问题里为什么说的是discount rate？ 李老师视频中说的IRR有multiple的现象，discount rate在实际案例中应该只有一个吧？
