Answer:
No. of chemistry books
= 10 × 12 = 120
Number of
physics books = 8 × 12 = 96
Number of
economics books = 10 × 12 = 120
A row matrix A
= [120 96 120] represents number of books and a column matrix 
Represents their
selling price per book.
Total amount is
given by product
AB = [120 93
120]
= [120 × 80 + 96
× 60 + 120 × 40]
= 960 + 5700 +
4800 = 20160
Total amount
received by bookshop = Rs.20160.
Assume, X, Y, Z,
W and P are matrices of order 2 × n, 3 × k, 2 × p, n × 3 and p × k,
respectively, Choose the correct answer in examples 21 and 22.
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