Question

A store keeper 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

Answer 1

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Answer 2

Answer:

Cost price is Rs.600.

Step-by-step explanation:

Given : A store keeper sells a book at 15% gain .Had he sold it for 18 more,he would have gained 18%.

To find: The cost price of the book?

Solution :

Let the CP of book be x.

A store keeper sells a book at 15% gain

$P_1=\frac{15}{100}x=\frac{3}{20}x$

He would have gained 18%

$P_2=\frac{18}{100}x=\frac{9}{50}x$

According to question,

$P_2-P_1=18$

$\frac{9}{50}x-\frac{3}{20}x=18$

$\frac{3}{100}x=18$

$x=\frac{18\times}{3}$

$x=600$

Therefore, Cost price is Rs.600.