I do not understand 2b. Can you explain the logic of the IRR calculation I used IRR (rate, values,-.9) for the smallest but, I do not understand why the -.9 is used and then on the largest it is just IRR(values). Can you please explain how you know what to use? It makes no sense to me.

Howell Petroleum, Incorporated, is trying to evaluate a generation project with the following cash flows: a-1. What is the NPV for the project if the company requires a return of 11 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) a- Should the company accept this project? 2. She No Yes Howell Petroleum, Incorporated, is trying to evaluate a generation project with the following cash flows: a-1. What is the NPV for the project if the company requires a return of 11 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) a- Should the company accept this project? 2. She No Yes