Question

The price of petrol goes up by 10%.by how much percent must a motrist reduce the consumption of petrol so that the expenditure on its remains unchanged?

Answer 1

$\huge\black{Step by step explanation}$

Let cost of 100 litre petrol be 100 rupees

By increasing price

Cost of 100 litre petrol = 110

In rupee 110 he got 100 litre petrol

100 rupees = (100/110)*100

100 rupees = 1000/11 litres

Decreasing in petrol

= 100-(1000/11)

= 100/11

= (9 whole 1/11)%

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