Question

If the SP of $10$ pens is equal to the CP of $11$ pens, find the profit percent.

• A. $10\%$
• B. $12.5\%$
• C. $15\%$
• D. $20\%$

Answer 1

The correct option is A $10\%$

Let the CP of one pen be 1. Therefore,
CP of 10 pens $=10$
SP of 10 pens $=$ CP of 11 pens $=11$
$\therefore$ Profit on selling 10 pens $=11-10=1$
$\therefore$ Profit percent $=\frac{Profit}{CP}\times 100\%=(\frac{1}{10}\times 100)\%=10\%$