Consider the following two mutually exclusive projects: Whichever project you choose, if any, you require a return of 15 percent 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.) Project A Project B c-1. What is the NPV for each project? (Do not round intermediate calculations round your answers to 2 decimal places, e.g., 32.16.)