Cant figure this out need help please!

Olsen \& Sons Inc. requires 12% retum on its investments. The company is consideting the followina two investment proiects: 1) If the company imposes a payback cutoff of three years for its investment projects, should it accept either of the two projects? 2) Which project is better, based on discounted payback period? 3) Which project is better, based on net present value? 4) Which project is better, based on profitability index? 5) Which project is better, based on modified internal rate of return