Question

The price of petrol increases by 25%. By what
percentage must a customer reduce the
consumption so that the bill on the petrol
does not alter?
A. 20%
B. 25%
C. 30%
D. 33.33%
- E. None of the above​

Answer 1

Answer:

let the old price of petrol be X

increment in price=25%

new price=X+25% of X

=X+25/100×X

=X+X/4

=5X/4

Increment in price with respect to older price=5X/4-X

=X/4

Decrement% with respect to new price=(X/4÷5X/4×100)%

=(X/4×4/5X×100)%

=20%

So, the consumer must reduce 20% of consumption of petrol so that the bill on petrol does not alter.

Step-by-step explanation:

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