I need to learn how to compute Payback Period, Net Present Value (NPV) and Internal Rate of Return (IRR)

Assume initial investment is $90,000 and interest = 8.0% for Project A Project B Project C Year Cash Flows Cash Flows Cash Flows 1 30,000 20,000 20,000 2 30,000 30,000 20,000 3 20,000 30,000 30,000 4 20,000 30,000 30,000 5 10,000 20,000 20,000 worksheet