$11-13.$

$($Calculating IRR, payback, and a missing cash flow$)$ The Merriweather Printing Company is trying to decide on the merits of constructing a new publishing facil$-$ity. 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:If you know that the project has a regular payback period of $2\mathrm{.}5$ years, what is the

project's IRR?