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7.Profit and Loss
medium
A sells an article to $B$ at a profit of $20 \%$ and $B$ sells it to $C$ at a loss of $10 \% .$ If $C$ pays $Rs.\,540$ for it, at what price did A buy?
A
$400$
B
$500$
C
$600$
D
$700$
Solution
In the transaction there is a profit of $20 \%$ and a loss of $10 \%$
$B'$s cost price $=540 \times \frac{100}{90}=Rs. 600$
$A'$s cost price $=600 \times \frac{100}{120}=Rs. 500$
Standard 13
Quantitative Aptitude