Given: The price of a certain article is increased by 15%
The customer wants to keep his expenditure same as before
Calculation: We know that:
When one of the factors is increased by x%,
Then to make the resultant unchanged,
The other factor must be decreased by =
(×100) Now, According to the question,
The price of the article is increased by 15%,
⇒ The required reduction in the consumption of the article =
×100% ⇒()×100%=()%=13.04% ∴ The required reduction in the consumption of the article is 13.04%.