HELP PLEASE

Tangshan Mining Company is considering investing in a new mining project. The firms cost of capital is 12 percent and the project is expected to have an initial after tax cost of $5,000,000. Furthermore, the project is expected to provide after-tax operating cash flows of ($1,800,000) in year 1, $2,900,000 in year 2, $2,700,000 in year 3 and $2,300,000 in year 4?

1. Maximum acceptable payback period of this project is 3 years. Calculate the payback period for this project.
2. Calculate the projects NPV.
3. Calculate the projects IRR. (Hint: You can calculate the IRR within the range of 5% and 10%)

Should the firm make the investment? Why

show all the work please thank you