MTG is considering replacing part of its computer network with the latest equipment. The relevant costs of the project and the corresponding savings are given below.

Year = 0

Net cash flow ($) = -100,000

Year = 1

Net cash flow ($) = 20,000

Year = 2

Net cash flow ($)= 30,000

Year = 3

Net cash flow ($) = 40,000

Year = 4

Net cash flow ($) = 50,000

Year = 5

Net cash flow ($) = 20,000

If the current cost of interest in 12% per annum on projects of this type. Calculate the net present value of the project and comment on the course of action to be taken.

Obtain also the NPV for a cost of interest of 20% and thus estimate the Internal Rate of Return.

I seriously do not know how to do this...Please help me....