Greystone, Inc., has the following mutually exclusive projects: a. Calculate the payback period for each project. (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) b. Based on the payback period, which project should the company accept? c. If the appropriate discount rate is 12 percent, what is the NPV for each project? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) d. Based on the NPV, which project should the company accept