Answer
The maximum rates are:
$\begin{bmatrix}
688.8 & 750.4 & 828.8 & 1108.8\\
1114.4 & 1153.6 & 1321.6 & 1237.6\\
\end{bmatrix}$
Work Step by Step
Multiply the matrix by a scalar of 1.12 to represent the 12% increase:
$\begin{bmatrix}
615(1.12) & 670(1.12) & 740(1.12) & 990(1.12)\\
995(1.12) & 1030(1.12) & 1180(1.12) & 1105(1.12)\\
\end{bmatrix}$ = $\begin{bmatrix}
688.8 & 750.4 & 828.8 & 1108.8\\
1114.4 & 1153.6 & 1321.6 & 1237.6\\
\end{bmatrix}$
Therefore, the maximum rates are:
$\begin{bmatrix}
688.8 & 750.4 & 828.8 & 1108.8\\
1114.4 & 1153.6 & 1321.6 & 1237.6\\
\end{bmatrix}$
