Q5 of 59 Page 9

A storekeeper sells a book at 15% gain. Had he sold it for 18 more, he would have gained 18%. Find the cost price of the book.

Let the CP of book be x

1st SP = SP at Profit of 15%.




= 0.15x


2nd SP = SP at Profit of 18%




= 0.18x


Also, 2nd SP = 1st SP + 18


⇒ 0.18x = 0.15x + 18


⇒ 0.03x = 18



⇒ x = 600


∴ CP of book is Rs.600


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