Please can you help solving the problem below step by step. Please don't show Excell calculation. Unless you solve the problem using both method.

A firm is considering a project that will cost $1 million and generate after-tax cash flows of $300,000 for five years.

If the projects discount rate is 12 percent, what is its NPV? Its IRR? Its profitability index? Its payback?

There is an exercise already that someone posted but the answer is not satisfactory.