Question

The cost price of $10$ articles is equal to the selling price of $9$ articles. Find the profit percent.

Answer 1

Given

$10cp=9sp$

$sp=\frac{10}{9}cp$

profit percent $=\frac{sp=cp}{cp}\times 100$

$=\frac{\frac{10}{9}-sp-cp}{cp}\times 100$

$=\frac{cp(\frac{10}{9}-1)}{}\times 100$

$=\frac{1}{9}\times 100=11.11\%$