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7.Profit and Loss
hard
The cost of an article including the sales tax is $Rs.\, 616$. The rate of sales tax is $10 \%$, if the shopkeeper has made a profit of $12 \%$, then the cost price of the article is in $Rs.$?
A
$350$
B
$500$
C
$650$
D
$800$
Solution
$110 \%$ of $S P=616$ (Rate of sales tax $=10\%$)
$S P=\frac{616 \times 100}{110}= Rs. 560, C P=\frac{100 \times S P}{100+g a i n \%}$
$C P=\frac{100 \times 560}{100+12}=R s .500$
Standard 13
Quantitative Aptitude