price of milk is increased by 20% to keep the expenditure unchanged at what percent the consumption should be decreased
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Two approaches for aptitude test takers :
Approach 1
Use relation :
Net change = A + B + AB/100
Here A = 20% , B is unknown and net change = 0
Net change = 20 + B + 20B/100 = 0
=> 20 + B + B/5 = 0
=> 100 = -6B
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