The list price of a book is Rs. 100. A dealer sells three such books for Rs. 274.50 after allowing discount at a certain rate. Find the rate of discount.
List price of 1 book = 100
S.P. of 3 books = 274.50
=> S.P. of 1 book = 274.5/3 = 91.5
=> Discount % = $$\frac{100-91.5}{100}$$ * 100
= 8.5%
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