If you know that the project has a regular payback of 2.1 years, what is the projects IRR?

(Calculating IRR, payback, and a missing cash flow) The Merriweather Printing Company is trying to decide on the merits of constructing a new publishing facility. The project is expected to provide a series of positive cash flows for each of the next four years. The estimated cash flows associated with this project are as follows: Year Project Cash Flow $760,000 370,000 290,000 510.000