PROFIT AND LOSS CHAPTER
CLASS-8
CH-11
The cost of petrol increases by 8%. By how much percentage must the consumption of the fuel reduce so that expenditure on it remains unchanged?
Answers
Answer:
Let price of petrol be Rs.100.
After increasing,
Price of petrol =100+
100
10
×100=Rs.110
Now, to keep same expenditure, the consumption should be reduced by x%(say).
Now,
x=
110
110−100
×100
⇒x=
110
10
×100≈9%
Hence, to keep same expenditure, the consumption should be reduced by 9%.
Answer:
here is your answer dear
Step-by-step explanation:
If the price of petrol is increased by 10% to keep the expenditure value as constant, then how much percentage must be reduced in its consumption?
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9 Answers

Janardan Kant
, Mechanical Engineering from Dr. A.P.J. Abdul Kalam Technical University (2016)
Answered 3 years ago
Let before increasing the price of petrol we are purchasing 1 litre petrol in 100 rs . So total quantity 100×1=100.
After increasing the price of petrol 10% let we are receiving x litre petrol. Then final quantity 110×x=100x
After equating initial and final quantity we will get the value of x.
100×1=110×x
Then x=10÷11
Initially we are getting 1 litre and after increment we are getting 10÷11
Reduction in amount of petrol 1-(10÷11)
That is 1÷11
1÷11×100
100÷11