Answer
The difference in prices between city B and city A is:
$B-A=\begin{bmatrix}
-0.5 & 0.5 &0.75\\
-0.5 & 0.5 & 0.75
\end{bmatrix}$
Work Step by Step
We have:
$A=\begin{bmatrix}
4.5 & 6 & 2.5\\
5.5 & 8 & 2.5
\end{bmatrix}$
$B=\begin{bmatrix}
4 & 6.5 & 3.25\\
5 & 8.5 & 3.25
\end{bmatrix}$
$B-A=\begin{bmatrix}
4-4.5 & 6.5-6 & 3.25-2.5\\
5-5.5 & 8.5-8 & 3.25-2.5
\end{bmatrix}$
$=\begin{bmatrix}
-0.5 & 0.5 &0.75\\
-0.5 & 0.5 & 0.75
\end{bmatrix}$
