Question

if a book is sold at 20% more than its usual price, an extra profit of rs. 120 would be made on it. find its usual selling price​

Answer 1

Let the usual selling price be x

Then 20% of x = x/5

x/5=120

x=600

Answer 2

Given:

A book is sold at 20% more than its usual price.

An extra profit of Rs. 120 would be made on it.

To find:

The usual selling price of the book.

Solution:

Let 'S' be the usual selling price.

A book is sold at 20% more than its usual price.

S + $\frac{20}{100}$ × S

S + $\frac{S}{5}$

An extra profit of Rs. 120 would be made on it.

Therefore,

S - ( S + $\frac{S}{5}$ )  = 120

$\frac{S}{5}$ = 120

S = 120 × 5

S = 600

The usual selling price is Rs. 600

Final answer:

The usual selling price of the book is Rs. 600