please help with parts c-1 through d !

Piercy, LLC, has identified the following two mutually exclusive projects: Year Cash Flow (A) Cash Flow (B) 0 -$55,000 -$55,000 1 31,000 18,500 2 25.000 22,500 3 18,500 27.000 13.000 25,500 4 a-1. What is the IRR for each of these projects? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) a-2. If you apply the IRR decision rule, which project should the company accept? b-1. Assume the required return is 11 percent. What is the NPV for each of these projects? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) b-2. Which project will you choose of you apply the NPV decision rule? c-1. Over what range of discount rates would you choose Project A? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g. 32.16.) c-2. Over what range of discount rates would you choose Project B? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) d. At what discount rate would you be indifferent between these two projects? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) % % a-1. Project A Project B a-2. b-1. Project A Project B b-2. C-1. c-2. d. Discount rate %