Question:
Tick (✓) the correct answer
The selling price of an article is $\frac{6}{5}$ of the cost price. The gain per cent is
(a) 20%
(b) 25%
(c) 30%
(d) 120%
Solution:
(a) 20%
Let Rs $x$ be the CP of each article.
SP of an article $=$ Rs $\frac{6}{5} \mathrm{x}$
Now, gain $=(\mathrm{SP}-\mathrm{CP})$
$=\operatorname{Rs}\left(\frac{6}{5} x-x\right)$
$=\operatorname{Rs} \frac{x}{5}$
$\therefore$ Gain percentage $=\left(\frac{\text { gain }}{\mathrm{CP}} \times 100\right) \%$
$=\left(\frac{\frac{x}{5}}{x} \times 100\right) \%$
$=\left(\left(\frac{x}{5} \times \frac{1}{x}\right) \times 100\right) \%$
$=20 \%$
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