Create a cash flow for a simple investment project with a 4-year life that produces a discounted payback of 3 years and an IRR of 8%/year if the MARR is 4%.

A simple investment is an investment in which the initial cash flows are negative and only one sign change occurs in the remaining net cash flow series. If the initial flows are positive and only one sign change occurs in the subsequent net cash flows, they are referred to as simple borrowing cash flows.

This is a create your own question so there is no information given about initial investment

Please show all steps and explain the process