Assume General Motors has a weighted average cost of capital of 10%. GM is considering investing in a new plant that will save the company $30 million over each of the first two years, and then $25 million each year thereafter. If the investment is $150 million, what is the net present value (NPV) of the project?

A) 65.2

B) -76.1

C) -86.9

D) 108.7

I cannot figure out how to solve with excel. Would be very helpful if solved with excel. Thanks