If cost of sugar increases by 25%. How much percent consumption of sugar should be decreased in order to keep expenditure fixed?

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If cost of sugar increases by 25%. How much percent consumption of sugar should be decreased in order to keep expenditure fixed?

A. 10%
B. 15%
C. 20%
D. 25%
E. None
Explanation:
100
125
—–
125 —– 25
100 —— ? => 20%