Find iRR(internal rate of return) of the following cash flows ?

\begin{tabular}{c|c|} \hline Year & Cashflow \\ \hline 0 & -500 \\ \hline 1 & 200 \\ \hline 2 & 300 \\ \hline 3 & 100 \\ \hline 4 & 100 \\ \hline WACC & 12% \\ \hline \end{tabular}