a shopkeeper advertises that all prices have been discounted 20%. if a certain article is on sale for Rs.28, what was its price before the sale?

Dear student,

Kindly find the answer to your query:

$$\begin{gathered} \mathrm{Let} \mathrm{the} \mathrm{price} \mathrm{before} \mathrm{was} \mathrm{Rs}. \mathrm{x} \\ \mathrm{So} \mathrm{according} \mathrm{to} \mathrm{the} \mathrm{question}, \\ \mathrm{x}- 20\% \mathrm{x} = 28 \\ \mathrm{x}- \frac{20\mathrm{x}}{100}= 28 \\ \frac{4\mathrm{x}}{5}= 28 \\ \mathrm{x} = 35 \\ \mathrm{So} \mathrm{the} \mathrm{price} \mathrm{was} \mathrm{Rs}. 35 \end{gathered}$$
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