10. 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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Answer:
Hey,
If she could buy 80 books costing ₹90 that means she had ₹7200 (as 80*90 is 7200)
Publisher
Discount=20%
IE selling price = 80% * 90
= ₹72
So, if the price of 1 book is 72 then
No. of books she can buy= 7200/72
= 100 books
Thus, she can buy 100 maths books from the publisher
Hope it helps
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