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Question

# In November, Lou E Gee sold 23 fridges, 17 stoves and 31 microwave ovens. His partner Rose A Lee sold 19 fridges, 29 stoves and 24 microwave ovens. In December, Lou’s sales were: 18 fridges, 7 stoves and 36 microwaves while Rose’s sales were: 25 fridges, 13 stoves and 19 microwaves. a. Write their sales for November as a $3\times 2$ matrix. b. Write their sales for December as a $3\times2$ matrix. c. Write their total sales for November and December as a $3\times 2$ matrix.

Solution

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$\textbf {(a)}$

Sales of November matrix is:

$\text {November} \qquad \begin{bmatrix} 23 & 19 \\ 17 & 29 \\ 31 & 24 \end{bmatrix}$

$\textbf {(b)}$

Sales of December matrix is:

$\text {December} \qquad \begin{bmatrix} 18 & 25 \\ 7 & 13 \\ 36 & 19 \end{bmatrix}$

$\textbf {(c)}$

Total sales for November and December:

$\text {Total sales} \qquad \begin{bmatrix} 23 & 19 \\ 17 & 29 \\ 31 & 24 \end{bmatrix} + \begin{bmatrix} 18 & 25 \\ 7 & 13 \\ 36 & 19 \end{bmatrix} = \begin{bmatrix} 41 & 44 \\ 24 & 42 \\ 67 & 43 \end{bmatrix}$

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