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Q.

The bookshop of a particular school 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 from selling all the books using matrix algebra.


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a

Rs. 20,160

b

Rs. 20,150

c

Rs. 20,170

d

Rs. 20,180 

answer is A.

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Detailed Solution

No. of chemistry books = 10 dozen
= 10x12
= 120
No. of physics books = 8 doxen
= 8x12
= 96
No. of economics books = 10 dozen
= 10x12
= 120
Now, S.P. of 1 Chemistry books Rs. 80
S.P of 1 Physics books = Rs. 60
S.P of 1 Economics books = Rs. 40
Total SP = 120x80+96x60+120x40
= 9000+5760+4800
= 20,160
          
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