Arithmetic Aptitude :: Percentage
10. If the price of petrol increases by 25%, by how much must a user cut down his consumption so that his expenditure on petrol remains constant?
Let the petrol 1 unit initial price be rs 100.
25% increase on rs 100= rs 125
since expenditure to remain constant 125*x= 100*1
So, consumer reduces =.20 unit i.e 20%