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7.Profit and Loss
medium
A vendor started selling vegetables at $Rs. 10$ per $k g,$ but couldn't find buyers at this rate. So, he reduced the price to $8.10 / kg ,$ but uses a faulty weight of $900\, g$ for $1\, kg .$ Find the percent change in the actual price or loss.
A
$5$
B
$10$
C
$15$
D
$20$
Solution
After reduction, $900\, g$ costs $Rs.8.10.$
$\therefore 1000\, g$ will $\operatorname{cost} \frac{1000}{900} \times 8.10=Rs. 9$
$\%$ Change in actual price or $\operatorname{loss} =\frac{10-9}{10} \times 100 \%=10 \%$
Standard 13
Quantitative Aptitude
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