Question

The two matrices show the cost of three different electronics prices (rows) at two different stores (columns). Matrix F is from 1995 and Matrix H is from 2005. Which matrix shows the change in prices from 1995 to 2005?
Note: Answer choices and matrices regarded to this question is below.

Answer 1

$H-F=\left[\begin{array}{ccc}198&201\\176&172\\256&267\end{array}\right]-\left[\begin{array}{ccc}234&245\\198&187\\312&345\end{array}\right]\\\\=\left[\begin{array}{ccc}198-234&201-245\\176-198&172-187\\256-312&267-345\end{array}\right]\\\\=\left[\begin{array}{ccc}-36&-44\\-22&-15\\-56&-78\end{array}\right]\\\\Answer:\ \boxed{A}$