help with part b please

Bruin, Incorporated has identified the following two mutually exclusive projocts: a-1. What is the IRR for each of these projects? Note: 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? Note: Do not round intermediate calculations and round your answers to 2 decimal places, e.g. 32.16. b-2. Which project will you choose if you apply the NPV decision rule? c-1. Over what range of discount rates would you choose Project A? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9., 32.16. c-2. Over what range of discount rates would you choose Project B? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9. 32.16. c3. At what discount rate would you be indifferent between these two projects? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16