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Direct and Inverse Proportions
The principal sanctioned a certain amount to the librarian to purchase some Mathematics books for the school library. She could buy 80 books casting Rs 90 each from the local book seller. There she approached to the publisher who offered her a 20% discount, Find the number of copies of Mathematics books which she could buy from the publisher for the sanctioned money.
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Given :
The school librarian could buy 80 books casting Rs 90 each from the local bookseller and also given that the publisher offered her a 20% discount.
To Find:
The number of copies of Mathematics books which she could buy from the publisher for the sanctioned money.
Solution:
The cost of a Mathematics books= Rs 90
The cost of 80 Mathematics books= 80×90 = Rs 7200
The publisher offered her a 20% discount.
Then the discount on each Mathematics book= 90×(20/100)= Rs 18
Therefore after the discount cost of each book = 90-18 =Rs 72
Therefore the number of copies of Mathematics books which she could buy from the publisher for the sanctioned money = Total amount / cost of each book
=7200/72
=100
Thus the number of copies of Mathematics books is 100.