Please Help Im getting this question wrong

Consider the following cash flows of two mutually exclusive projects for Scotia Rubber Company. Assume the discount rate for Scotia Rubber Company is 8 percent. (Do not round intermediate calculations. Round the answers to 2 decimal places. Omit \$ sign in your response.) a. What is the payback period for each project? b. What is the NPV for each project? b. What is the NPV for each project? c. What is the IRR for each project? (Omit '\%' sign in your response.) d. Calculate the incremental IRR for the cash flows. (Omit '\%' sign in your response.) Incremental IRR \%