Question

If the selling price of an article is $\frac{4}{5}$th of its cost price ,find the loss percent ?

Answer 1

Let the cost price be $x$.
Then, selling price: $\frac{4}{5}x$
Loss = C.P.-S.P.=$x-\frac{4}{5}x=\frac{1}{5}x$
Loss percent = $\frac{\text{Loss}}{\text{Cost Price}}\times 100\%$
$=\frac{x/5}{x}\times 100\%$
$=\frac{1}{5}\times 100\%$
$=20\%$