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4. 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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Let's calculate the effective cost per book after applying the 20% discount from the publisher. The cost of each book from the local bookseller is Rs 90. The discount offered by the publisher is 20%, which means she will pay only 80% of the original cost. Effective cost per book from the publisher...
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Let's calculate the effective cost per book after applying the 20% discount from the publisher. The cost of each book from the local bookseller is Rs 90. The discount offered by the publisher is 20%, which means she will pay only 80% of the original cost. Effective cost per book from the publisher = 80% of Rs 90 Effectivecostperbook=0.8×90Effectivecostperbook=0.8×90 Now, let's find the number of books she can buy with the sanctioned amount. Let NN be the number of books she can buy. Total sanctioned amount = Total cost of books N×Effectivecostperbook=TotalsanctionedamountN×Effectivecostperbook=Totalsanctionedamount N×0.8×90=TotalsanctionedamountN×0.8×90=Totalsanctionedamount Now, to find NN: N=Totalsanctionedamount0.8×90N=0.8×90Totalsanctionedamount You need to know the total sanctioned amount to calculate the number of books she can buy. If you have that information, substitute it into the formula to find NN. read less
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