Isaac has analyzed two mutually exclusive projects that have 3-year lives. Project a has an npv of $81,406, a payback period of 2. 48 years, and an aar of 9. 31 percent. Project b has an npv of $82,909, a payback period of 2. 57 years, and an aar of 9. 22 percent. The required return for project a is 11. 5 percent while it is 12 percent for project b. Both projects have a required aar of 9. 25 percent. Isaac must make a recommendation and justify it in 15 words or less. What should his recommendation be?.