The printed price of a book is ` 320. A retailer pays ` 244.80 for it. He gets successive discounts of 10% and an another rate. His second rate is :

Explanation

Printed price = ` 320, d1 = 10% Let d2 = x%, Amount actually paid = ` 244.80 æ ö æ ö 10 x - - ´ 1 1 320 So, amount actually paid = ç ÷ ç ÷ è ø è ø 100 100 ( ) - 100 x 90 = ´ ´ 244.80 320 100 100 ´ ´ 100 – x = 244.80 100 100 = 85 Þ x = 15% ´ 90 320 p q æ ö - = tan 3