Question

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

Answer 1

it may help you it is correct I don't know

Answer 2

Answer: The cost price of the book would be Rs. 600.

Step-by-step explanation:

Since we have given that

Shopkeeper sells a book at profit of 15%

Shopkeeper sells a book at profit of 18%, he would sold it for Rs, 18 more at that time.

Let x be the cost price of the book.

According to question, it becomes,

$\dfrac{100+18}{100}x-\dfrac{100+15}{100}x=18\\\\\dfrac{118}{100}x-\dfrac{115}{100}x=18\\\\\dfrac{3}{100}x=18\\\\x=\dfrac{18\times 100}{3}\\\\x=6\times 100\\\\x=600$

Hence, the cost price of the book would be Rs. 600.