# The bookshop of a

It is given that the bookshop of a particular school has 10 dozen chemistry books, 8 dozen physics books, 10 dozen economics books.

Number of chemistry book = 10 × 12
= 120

Number of physics book = 8 × 12

= 96

Number of economics book = 10 × 12

= 120

Their selling prices are Rs 80, Rs 60 and Rs 40 each respectively.

Let A be the matrix of books per subject.4

A=

Let B denotes selling price of the books.

The total amount of money = number of books × selling price

= [120 × 80 + 96 × 60 + 120 × 40]

= (9600 + 5760 + 4800)

= 20160

Therefore, the bookshop will receive Rs. 20160 from the sale of all these books.

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