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7.Profit and Loss
medium
If the selling price of $50$ articles is equal to the cost price of $40$ articles, then the loss or gain percent is
A
$20 \%$ loss
B
$20 \%$ gain
C
$25 \%$ loss
D
$25 \%$ gain
Solution
$S.P.$ of $50$ articles $=$ $C.P.$ of $40$ article
$\therefore \quad$ $C.P.$ of $1$ article $=$ $S.P.$ of $1.25$ article
$\%$ loss $=\frac{\text { C.P. }-\text { S.P. }}{\text { C.P. }} \times 100$
$=\frac{\text { S.P. of } 1.25 \text { article }-\text { S.P. of } 1 \text { article }}{\text { S.P. of } 1.25 \text { article }} \times 100$
$=\frac{0.25}{1.25} \times 100=20 \%$
Standard 13
Quantitative Aptitude
