Question

The cost price of an article is $4/5$ times of its selling price. Find the loss or the gain as percent.

Answer 1

Let $S.P.=1$
$C.P.=\frac{4}{5}\times 1=\frac{4}{5}$
Formula for finding the gain $\%$ is given below,
$\therefore$ Gain = Selling Price - Cost Price
i.e. Gain $=S.P-C.P.$
$=1-\frac{4}{5}=\frac{5-4}{5}=\frac{1}{5}$
Gain $\%=\frac{Gain}{C.P.}\times 100=\frac{\frac{1}{5}}{\frac{4}{5}}\times 100=\frac{1}{5}\times \frac{5}{4}\times 100=25\%$