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CBSE Class 8 Answered

Respected sir/ma'am, Can you please provide me with the answer of this question: In the new Budget, the Price of Petrol rose by 10%. By how much percent must one reduce the consumption so that the expenditure does not increase. Thank you  
Asked by angelina.rozanne | 19 Nov, 2018, 11:02: PM
answered-by-expert Expert Answer
Let x liters be the consumption of petrol before budget at total cost Rs. y.
 
Hence before budget, cost of 1 liter petrol = Rs. y / x
 
cost of 1 liter petrol after budget = Rs. 1.1 y / x
 
hence quantity of petrol can be obtained for the initial amount Rs. y   = y / (1.1y/x)  = x / 1.1  = 10x / 11 liter
 
reduction in quantity of petrol ,  x - ( 10x/11 ) = x / 11
 
required percentage of reduction in quantity of petrol  after budget = [ (x/11) / x ] 100 = 100 /11 ≈ 9.1%
Answered by Thiyagarajan K | 20 Nov, 2018, 01:55: AM
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