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7.Profit and Loss
medium
A shopkeeper buys an article at $8$ for $Rs\,16$ and sells them at $9$ for $Rs\,20$. What is his gain or loss percent?
A
$10 \%$ loss
B
$10 \%$ gain
C
$11 \frac{1}{9} \%$ gain
D
$11 \frac{1}{9} \%$ loss
Solution

$\%$ profit or loss $=\frac{8 \times 20-9 \times 16}{9 \times 16} \times 100$
$=\frac{1600}{9 \times 16}=\frac{100}{9}=11 \frac{1}{9} \%$
$\therefore$ Profit $=11 \frac{1}{9} \%$
Standard 13
Quantitative Aptitude