Question

a bookseller sold a book and earned a profit that is equal to one fifth of the cost price of the book. if the selling price of the book is 180rs. find the cost price of the book.​

Answer 1

The cost price of the book is Rs. 150.

Step-by-step explanation:

The bookseller sold a book and earned a profit that is equal to one-fifth of the cost price of the book.

If the cost price of the book is assumed to be Rs. x and its selling price is given to be Rs. 180, then we can write the equation as

$180 - x = \frac{x}{5}$

⇒ $180 = x + \frac{x}{5}$

⇒ $\frac{6x}{5} = 180$

⇒ x = 150

Therefore, the cost price of the book is Rs. 150. (Answer)