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7.Profit and Loss
medium
$60 \%$ of the cost price of an article is equal to $50 \%$ of its selling price. Then the percentage of profit or loss on the cost price is
A
$20 \%$ loss
B
$16 \frac{2}{3} \%$ profit
C
$20 \%$ profit
D
$10 \%$ loss
Solution
Let, the $C.P.$ of article be $₹ 100$ and its $S.P.$ be $₹ x$
Now, according to the question,
$100 \times \frac{60}{100}=\frac{x \times 50}{100}$
$\Rightarrow 60=\frac{x}{2} \Rightarrow x=120$
$\therefore \quad \operatorname{Gain} \%=20 \%$
Standard 13
Quantitative Aptitude