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The following matrix consists of a shoe store's inventory of sneakers, slippers and garden boots in sizes small, medium, and large:






Small
Medium
Large


Sneakers
20
15
10


Slippers
30
25
18


Garden Boots
15
12
8




(a) Form a 3x3 matrix to represent the information given above.
Sneakers sell for 
$150; Slippers sell for 
$30, and Garden Boots sell for 
$125.
(b) Form a 1x3 matrix to represent this information.

[2]
(c) Use matrix multiplication to determine how much the inventory is worth.

88. The following matrix consists of a shoe store's inventory of sneakers, slippers and garden boots in sizes small, medium, and large:\newline\begin{tabular}{|l|l|l|l|}\newline\hline & Small & Medium & Large \\\newline\hline Sneakers & 2020 & 1515 & 1010 \\\newline\hline Slippers & 3030 & 2525 & 1818 \\\newline\hline Garden Boots & 1515 & 1212 & 88 \\\newline\hline\newline\end{tabular}\newline(a) Form a 33x33 matrix to represent the information given above.\newlineSneakers sell for $150 \$ 150 ; Slippers sell for $30 \$ 30 , and Garden Boots sell for $125 \$ 125 .\newline(b) Form a 11x33 matrix to represent this information.\newline[2] [2] \newline(c) Use matrix multiplication to determine how much the inventory is worth.

Full solution

Q. 88. The following matrix consists of a shoe store's inventory of sneakers, slippers and garden boots in sizes small, medium, and large:\newline\begin{tabular}{|l|l|l|l|}\newline\hline & Small & Medium & Large \\\newline\hline Sneakers & 2020 & 1515 & 1010 \\\newline\hline Slippers & 3030 & 2525 & 1818 \\\newline\hline Garden Boots & 1515 & 1212 & 88 \\\newline\hline\newline\end{tabular}\newline(a) Form a 33x33 matrix to represent the information given above.\newlineSneakers sell for $150 \$ 150 ; Slippers sell for $30 \$ 30 , and Garden Boots sell for $125 \$ 125 .\newline(b) Form a 11x33 matrix to represent this information.\newline[2] [2] \newline(c) Use matrix multiplication to determine how much the inventory is worth.
  1. Form Inventory Matrix: Form a 33x33 matrix for the inventory of sneakers, slippers, and garden boots in sizes small, medium, and large.\newlineInventory Matrix:\newline[20151030251815128] \begin{bmatrix} 20 & 15 & 10 \\ 30 & 25 & 18 \\ 15 & 12 & 8 \end{bmatrix}
  2. Form Price Matrix: Form a 11x33 matrix for the prices of sneakers, slippers, and garden boots.\newlinePrice Matrix:\newline[15030125] \begin{bmatrix} 150 & 30 & 125 \end{bmatrix}
  3. Calculate Total Value: Multiply the price matrix by the inventory matrix to find the total value of the inventory.\newlineCalculation:\newline[15030125][20151030251815128]=[(15020+3030+12515)(15015+3025+12512)(15010+3018+1258)]=[615046502900] \begin{bmatrix} 150 & 30 & 125 \end{bmatrix} \cdot \begin{bmatrix} 20 & 15 & 10 \\ 30 & 25 & 18 \\ 15 & 12 & 8 \end{bmatrix} = \begin{bmatrix} (150 \cdot 20 + 30 \cdot 30 + 125 \cdot 15) & (150 \cdot 15 + 30 \cdot 25 + 125 \cdot 12) & (150 \cdot 10 + 30 \cdot 18 + 125 \cdot 8) \end{bmatrix} = \begin{bmatrix} 6150 & 4650 & 2900 \end{bmatrix}

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