Aman offers a discount scheme, such that on buying 12 rough copies, get x rough copies for free. If the equivalent percentage discount is 25%, then what is the value of x?

Correct option is C

Given:

Total rough copies bought: 12

Free rough copies: x

Discount percentage: 25%

Solution:

Here, the total number of copies = 12 + x.

$$25 = \frac{x}{12 + x} \times 100 \\ \ \\\frac{x}{12 + x} = \frac{25}{100} = \frac{1}{4} \\ \ \\x = \frac{1}{4} \times (12 + x)$$​

4x = 12 + x

4x - x = 12

3x = 12

x = 4
The value of x is 4.