Answer
$\begin{bmatrix}-30&14\\38&-36\\-20&30\end{bmatrix}$
Work Step by Step
We are given the matrices:
$$A=\begin{bmatrix}125&100\\278&251\\225&270\end{bmatrix},\text{ }B=\begin{bmatrix}95&114\\316&215\\205&300\end{bmatrix}$$
Calculate $B-A$:
$$\begin{align*}
B-A&=\begin{bmatrix}95&114\\316&215\\205&300\end{bmatrix}-\begin{bmatrix}125&100\\278&251\\225&270\end{bmatrix}\\
&=\begin{bmatrix}95-125&114-100\\316-278&215-251\\205-225&300-270\end{bmatrix}\\
&=\begin{bmatrix}-30&14\\38&-36\\-20&30\end{bmatrix}.
\end{align*}$$
The difference $B-A$ represents the difference between the sales of this month and the sales of the last month.
