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7.Profit and Loss
hard
By what fraction selling price $(S.P.)$ must be multiplied to get the cost price $(C.P.)$ if the loss is $20 \% ?$
A
$\frac{4}{5}$
B
$\frac{8}{5}$
C
$\frac{5}{4}$
D
$\frac{6}{5}$
Solution
If $\operatorname{Loss}=20 \%$
$\therefore S.P =\frac{100-20}{100} \Rightarrow \frac{80}{100} \Rightarrow \frac{4}{5}$
To make it equal to $C.P$ which is $100 \%,$ we must multiple the fraction with $\frac{5}{4}$
$S.P$ $=\frac{4}{5} \times \frac{5}{4}=1[ C . P ]$
Standard 13
Quantitative Aptitude