计算器按到CPT-NPV没有反应

问题如下：

CC Inc. has a project with cash flows as following:

The required rate of return for the project is 10%. The net present value(NPV) is closest to:

选项：

-46.47

-36.67

-43.43

解释：

C is correct.

$NPV=-200+\frac{50}{(1+10\%)}+\frac{50}{{(1+10\%)}^2}+\frac{40}{{(1+10\%)}^3}+\frac{40}{{(1+10\%)}^4}+\frac{20}{{(1+10\%)}^5}$

Or use a calculater, CF0=-200, Enter, C01=50,Enter, C02=50, Enter, C03=40, Enter, C04=40,Enter, C05=20, NPY, I/Y=10,Enter, CPT. NPV=-43.43.