请教下585.53是怎么计算出来的？

问题如下：

Hermann Corporation is considering an investment of €375 million with expected after-tax cash inflows of €115 million per year for seven years and an additional after-tax salvage value of €50 million in Year 7. The required rate of return is 10 percent. What is the investment’s PI ?

选项：

1.19.

1.33.

1.56.

解释：

C is correct.

$PV={\displaystyle \sum _{t=1}^7\frac{115}{{1.10}^t}}+\frac{50}{{1.10}^7}=585.53$ Million euros

$PI=\frac{585.53}{375}=1.56$