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7.Profit and Loss
medium
If the $CP$ of $50$ items is equal $SP$ of $40$ items then what is the profit or loss $\% ?$
A
$20$
B
$15$
C
$25$
D
$35$
Solution
As, $CP$ of $50$ items $=$ $SP$ of $40$ items
$\Rightarrow 50 \times( CP$ of $1$ item $)=40 \times( SP$ of $1$ item $)$
$\Rightarrow \quad \frac{ CP \text { of } 1 \text { item }}{\text { SP of } 1 \text { item }}=\frac{40}{50}=\frac{4}{5}$
Profit$\%$ $=\frac{S P-C P}{C P}=\frac{5-4}{4} \times 100=25 \%$
Standard 13
Quantitative Aptitude