Matrices & Systems · Medium problem

Let $A = \begin{pmatrix}3 & 0 & 4 \\ 0 & 2 & -2\end{pmatrix}$ and $B = \begin{pmatrix}-3 & 1 \\ 4 & 2 \\ 3 & 4\end{pmatrix}$. Find the entry in row $2$, column $2$ of $AB$.