In 2012, the price of arhar/toor daal increased by 50%, by what % should a housewife reduce the consumption of arhar/toor daal so that expenditure on arhar/toor daal can be same as before ?
As price increase and consumption are inversely proportional,
if one increases by 1/x then other should reduce by 1/(x+1)
hence 50% is 1/2, consumption should reduce by 1/(2+1) = 1/3 = 33.33%