Problem 8-31 Mutually Exclusive Investments (LO5) Here are the cash-flow forecasts for two mutually exclusive projects: a-1. What is the NPV of each project if the opportunity cost of capital is 3% ? Note: Do not round intermediate calculations. Round your answers to 2 decimal places. a-2. Which project would you choose? b-1. What is the NPV of each project if the opportunity cost of capital is 15% ? Note: Do not round intermediate calculations. Round your answers to 2 decimal places. b-2. Which would you choose