need help on calculating discounted payback!!!

Consider the following two mutually exclusive projects: Cash Flow Cash Flow Year -346,000 -$48,000 24,400 22,400 19,900 15,000 49,000 69,000 69,000 444,000 2 4 Whichever project you choose, if any, you require a 16 percent return on your investment. a-1 What is the payback period for each project? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) Payback period Project A Project B 3.36 years 2.08 years a-2 If you apply the payback criterion, which investment will you choose? O Project A ProjectB b-1 What is the discounted payback period for each project? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) Project A Project B Discounted payback period years years