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A certain bookshop has 10 dozen Chemistry books, 8 dozen Physics books, 10 dozen Economics books.

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A certain bookshop has 10 dozen Chemistry books, 8 dozen Physics books, 10 dozen Economics books. Their selling prices are Rs. 80, Rs. 60 and Rs. 40 each respectively. Find the total amount the bookshop will receive by selling all the books, using matrix algebra.

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Number of books

Selling price in rupees B =  [80(Che), 60(Phy), 40(Eco)]

Total value of the books in the shop

AB = [120 96 120] [80, 60, 40]

= [120 × 80 + 96 × 60 + 120 × 40]

= [9600 – 5659 + 4800]

= [20160] in rupees

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