how do I figure this out on a finacial calculator

Question 6: (10 points) (IRR, payback, and calculating a missing cash flow) Mode Publishing is considering a new printing facility that will involve a large initial outlay and then result in a series of positive cash flows for four years. The estimated cash flows associated with this project are:

year project cash flow

0 ?

1 810 mil

2 350 mil

3 280 mil

4 540 mil

If you know that the project has a regular payback of 2.9 years, what is the project's internal rate of return?

a. The IRR of the project is:

%