Daal is now being sold at Rs. 20 a kg. During last month its rate was Rs. 16 per kg. By how much percent should a family reduce its consumption so as to keep the expenditure fixed?
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Answer / Mohd Kashif Zaidi
The family's current daal expenditure is: 20 * kilograms_of_daal. Last month, the expenditure was: 16 * kilograms_of_daal. The difference in expenditures is: (20 - 16) * kilograms_of_daal = 4 * kilograms_of_daal. To keep the expenditure fixed, the family should reduce its daal consumption by 100 * (4 / 16) % = 100 * (1/4) % = 25%.
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