The cooperative stores of a particular school has 10 dozen physics books,
Question:

The cooperative stores of a particular school has 10 dozen physics books, 8 dozen chemistry books and 5 dozen mathematics books. Their selling prices are Rs. 8.30, Rs. 3.45 and Rs. 4.50 each respectively. Find the total amount the store will receive from selling all the items.

Solution:

Stock of various types of books in the store is given by

Selling price of various types of books in the store is given by

$Y=\left[\begin{array}{l}8.30 \\ 3.45 \\ 4.50\end{array}\right] \begin{gathered}\text { Physics } \\ \text { Chemistry } \\ \text { Mathematics }\end{gathered}$

Total amount received by the store from selling all the items is given by

$X Y=\left[\begin{array}{lll}120 & 96 & 60\end{array}\right]\left[\begin{array}{l}8.30 \\ 3.45 \\ 4.50\end{array}\right]$

$=[(120)(8.30)+(96)(3.45)+(60)(4.50)]$

$=[996+331.20+270]$

 

$=[1597.20]$

Required amount = Rs 1597.20

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