What are IRR's and crossover rate? please help solve???

Consider the following two mutually exclusive projects: What is the IRR of Project X? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) IRR % What is the IRR of Project Y? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) IRR % What is the crossover rate for these two projects? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Crossover rate %