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7.Profit and Loss
hard
A trader allows a trade discount of $20 \%$ and a cash discount of $6 \frac{1}{4} \%$ on the marked price of the goods and gets a net gain of $20 \%$ of the cost. By how much above the cost should the goods be marked for the sale? (in $\%$)
A
$40$
B
$50$
C
$60$
D
$70$
Solution
Let, $C.P.$ of article $=₹ 100$ and marked price $=₹ x$
single equivalent discount
$=\left(20+\frac{25}{4}-\frac{20 \times 25}{400}\right) \%=25 \%$
Now, according to the question,
$x \times \frac{75}{100}=120$
$\Rightarrow x=\frac{120 \times 100}{75}=160$
$\therefore \quad$ The required percentage $=(160-100)=60 \%$
Standard 13
Quantitative Aptitude