the price of sugar was raised by 25% by how much per cent should a householder reduce its combustion so that there may be no change in her montly income
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20%
Price x Consumption = Expenditure. So, for the expenditure to remain constant, when 1 quantity increases the other quantity should decrease proportionally. Hence, consumption (quantity) = 100/25 = 4 kg. So, to maintain the expenditure when the price of sugar increases by 25%, one should decrease the consumption by 20%.
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