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$C.P.=₹\ 550,\ loss=1\ whole\ \frac{2}{5},\ S.P.=?$.
Given: $C.P.=₹\ 550,\ loss=1\ whole\ \frac{2}{5}=\frac{7}{5}$.
To do: To find $S.P.$
Solution:
$S.P.=\frac{C.P.\times( 100-loss)}{100}$
$\Rightarrow S.P.=\frac{550( 100-\frac{7}{5})}{100}$
$\Rightarrow S.P.=\frac{550( \frac{500-7}{5})}{100}$
 
$\Rightarrow S.P.=\frac{550( \frac{493}{5})}{100}$
$\Rightarrow S.P.=\frac{110\times493}{100}$
$\Rightarrow S.P.=542.3$
Thus, S.P. is $₹\ 542.3$
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