Ratio,Proportion, Percentages and Discounting Q.2

2The price of cooking oil has increased by 25%. The percentage of reduction that a family should effect in the use of cooking oil so as not to increase the expenditure on this account is

Option : C
Explanation : Let original price = 100
Original quantity = 100
Total expenditure = 100 × 100
New price = 100 + 25 = 125
New quantity = Q
As expenditure is to be kept same, 100 × 100 = 125 × Q
Q = (100 × 100)/125 = 80. % reduction in quantity = 100 - 80 = 20

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