Question

How many percent should a man reduce the use of Petrol whose price has increased by 10% so that he may have to spend no extra money?​

Answer 1

Answer:

If petrol price increase by 10% or 1/10, consumption will decrease by 1/(10+1) = 1/11 or 9 1/11% to keep expenditure constant.

Answer 2

Answer:

100/11 % = 9.09 %

Step-by-step explanation:

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% = 9.09%

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