Rohan sold a toy for Rs. 220 making a profit of 10%. Find cost price of toy.

Given: Rohan sold a toy for Rs. 220 making a profit of 10 %

To find: Cost price of toy

Solution:

Selling Price = Rs. 220

We know Profit % = $\frac{Selling Price - Cost Price}{Cost Price} \times 100$

So, $10 = \frac{220 - Cost Price}{Cost Price} \times 100$

$\frac {10}{100} = \frac{220 - Cost Price}{Cost Price} $

$\frac {10}{100} \times Cost Price= 220 - Cost Price $

$\frac {Cost Price}{10} = 220 - Cost Price $

$\frac {Cost Price}{10} + Cost Price= 220  $

$\frac {11 \times Cost Price}{10} = 220  $

$Cost Price = 220 \times 10 \div 11  $

Cost Price = Rs. 200