The cost of food accounted for 25% of the income of a particular family. if the income gets raised by 20%, then what should be the percentage point decrease in the food expenditure as a percentage of the total income to keep the food expenditure unchanged between the two years?
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let income 100 so cost of food is rs 25
now 20% increase so 120
now cost of food is 120 × 25/100 =120 ×1/4 =30
30 - 25 =5
5/30 ×100 =1/6×100=16.66% must decrease
now 20% increase so 120
now cost of food is 120 × 25/100 =120 ×1/4 =30
30 - 25 =5
5/30 ×100 =1/6×100=16.66% must decrease
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