Question

If the price of rice is increased by 15%. by how much per cent should a homemake
reduce the consumption of rice so that the expenditure remains the same?
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Answer 1

let the price and consumption of rice be 100and x% Will reduce so that expenditure remains the same.now expenditure=100×100and new expenditure=115×(100-x%) therefore 100×100=115×(100-x%)or10000÷115=100-x℅or2000÷23=100-x%or x%=100-2000÷23=300÷23=13.4