# Single copies of a book cost Rs.16 each, but purchasers of 20 or more books pay only Rs.13 per book. What is the value of n<20 for which one could buy 20 books at a lower total cost than one could buy exactly "n" books?

Question asked by: haappyone

Asked on: 22 Jan 2011

The number 18 is halfway between 16 and 20.

So maybe that is the reason why the answer is 18?

To be honest I don't know but hopefully someone here will be able to give you a proper answer.

By: knowitall

Replied at: 23 Jan 2011

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