please help with explanation, ty :)

A firm is considering the following projects. Its opportunity cost of capital is 10%. Cash Flows, $ -5 , 3 -1,3 -5 , 300 Proj ect c Time: 1 +1,075 +1,075 2 +1,075 +1,300 +1,075 3 +3, 150 +2 , 150 +3 , 150 4 +3 , 150 +5 , 300 a-I. What is the payback period on each project? (Do not round intermediate calculations. Round your answers to the nearest whole number.) Project A Project B Project C Payback Period years years years a-2. What is the discounted payback period on each project? (Do not round intermediate calculations. Round your answers to 2 decimal places. If any of the projects does not pay back on a discounted basis, enter zero ("0").) Project A Project B Project C Discounted Payback Period years years years