Question

The cost price of $12$ pens is equal to selling price of $10$ pens. Find the profit percentage.

Answer 1

Let the cost price of $1$ pen is Re $x$

Cost of $10$ pens $=10x$

Selling price of $10$ pens $=12x$

Profit = $12x-10x=2x$

Profit percentage $=[\frac{\text{Profit}}{\text{Cost}}\times 100]$%

$=[\frac{2x}{10x}\times 100]$%

$=2\times 10$%

$=20$%

Hence, the profit is $20\%$