NEED ASAP!!!!!

A firm is considering the following projects. Its opportunity cost of capital is 10%. a-1. What is the payback period on each project? (Do not round intermediate calculations. Round your answers to the nearest whole number.) 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 poy back on a discounted basis, enter zero ("O").) b. Given that you wish to use the payback rule with a cutoff period of 2 years, which projects would you accept