Here is an online NPV calculator which shows a NPV of $79.01

for you problem:

http://www.calculatorsoup.com/calculator...

"An investment of $83 generates after-tax cash flows of $44.00 in Year 1, $68.00 in Year 2, and $135.00 in Year 3. The required rate of return is 20 percent."

NPV = -83 + 44/1.20 + 68/1.20^2 + 135/1.20^3 = $79.01

An investment of $83 generates after-tax cash flows of $44.00 in Year 1, $68.00 in Year 2, and $135.00 in Year 3. The required rate of return is 20 percent. The net present value is

Thanks please help