Need explanation on the positive and negative IRR's and how they are calculated in part a-2) b.

Howell Petroleum, Inc., is trying to evaluate a generation project with the following cash flows: Year 0 1 2 Cash Flow 538,400,000 62,400,000 - 11,400,000 a-1. What is the NPV for the project if the company requires a return of 10 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) NPV 9. Should the firm accept this project? O No Yes b. (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) This project has two IRR's, namely percent and percent, in order from smallest to largest. (Note: If you can only compute one IRR value, you should input that amount into both answer boxes in order to obtain some credit.)