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7.Profit and Loss
hard
A man sells an article at $5 \%$ above its cost price. If he had bought it at $5 \%$ less than what he had paid for it and sold it at $Rs.\, 2$ less, he would have gained $10 \% .$ The cost price of the article is (in $Rs.$)
A
$400$
B
$100$
C
$200$
D
$300$
Solution
Let $CP$ be ₹ $x$.
$S.P$. $=x \times \frac{105}{100}=\frac{105 x}{100}=\frac{21 x}{20}$
New $C.P.$ $=x \times \frac{95}{100}=\frac{19 x}{20}$
New $S.P.$ $=\frac{19 x}{20} \times \frac{110}{100}=\frac{209}{200}$
According to the question, $\frac{21 x}{20}-\frac{209 x}{200}=2$
$\Rightarrow \frac{210 x-209 x}{200}=2$
$\Rightarrow x / 200=2 \Rightarrow x=Rs. 400$
Standard 13
Quantitative Aptitude