Janina, Incorporated, has the following mutually exclusive projects. a-1. Calculate the payback period for each project. (Do not round intermediate calculations and round your answers to 3 decimal places, e.g., 32.161.) a-2. If the company's payback period is two years, which, if either, of these projects should be chosen? Project A Project B Both projects Neither project b-1. What is the NPV for each project if the appropriate discount rate is 15 percent? (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) b-2. Which, if either, of these projects should be chosen if the appropriate discount rate is 15 percent? Project A Project B Both projects Neither project