⇒First Approach
Let $x be the Marked price of an Item.
Discount =20%
Original Price after Discount = $p
\(\rightarrow x-\frac{20x}{100}=p\\\\\rightarrow \frac{80x}{100}=p\\\\ \rightarrow \frac{4x}{5}=p\\\\ \rightarrow x=\frac{5p}{4}\)
⇒Marked price of the Item \(=\frac{5p}{4}\)
⇒Second Approach
If, p=Original Price of the Commodity
Discount =20%
Price after Discount
\(=p-\frac{20p}{100}\\\\=\frac{80p}{100}\\\\=\frac{4p}{5}\)
