9-16 Compute the (a) net present value, (b) internal rate of return (IRR), and (c) discounted payback period (DPB) for each of the following projects. The firm's required rate of return is 14 percent. Project Alpha $(220,000) 120,000 120,000 Project Beta $300.000 Which project(s) should be purchased if they are independent? Which project(s) should be purchased it they are mutually exclusive