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The price of the sugar goes up by 30%. By what percent should Sita reduce her consumption so that the expenditure does not increase?
Since, Expenditure = price$$\times$$ consumption
And Expenditure is constant. So, price is inversely proportional to consumption.
Ratio of price = 10 : 13
So, ratio of consumption = 13 : 10
% decrease in consumption = $$\frac{3}{13}$$ $$\times100$$
= $$\frac{300}{13}$$%
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