Can't find B1 for project B (got 3.11 but it says its wrong) Thanks

Consider the following two mutually exclusive projects: Whichever project you choose, if any. you require a 15 percent return on your investment.a-1 What is the payback period for each project? (Round your answers to 2 decimal places, (e.g.,32.16)) a-2 If you apply the payback criterion, which investment will you choose? Project A Project B b-1 What is the discounted payback period for each project? (Do not round intermediate calculations and round your final answers to 2 decimal places, (e.g., 32.16)) b-2 If you apply the discounted payback criterion, which investment will you choose? Project A Project B c-1 What is the NPV for each project? (Do not round intermediate calculations and round your final answers to 2 decimal places, (e.g.. 32.16))