Question

the price of petrol increased by 25%. By what percentage must a customer reduce the consumption so that the earlier bill on the petrol does not alter?​

Answer 1

Answer:

By 20%.

Step-by-step explanation:

Just take an example of the petrol cost and volume.

Now apply the situation for the cost and volume.

You will get the answer.

Answer 2

Answer:  -6.25%

Step-by-step explanation: Assuming Cost of Petrol = ₹100

Inreased Petrol Price is 25%

So, the increased price must be ₹100 + (25/100)% = ₹125 ie. now cost for 100% consumption.

Reduced Consumption is 25%

So, the reduced price must be 100% - 25% = 75% from increased cost.

And now to find the percentage of the rise or fall of price incurred to the person by reducing his consumption by 25%

This can be calculated by,

Assuming 100% as 125 units (rupee) and 75% as x

Cross Multiplying we get,

(125*75)/100 = ₹93.75

Therefore the change in price is -6.25% from his old price after reducing consumption.

(ie) He paid ₹100 for petrol, and by reducing his consumption he only pays ₹93.75.

Rise or Fall percentage = -6.25%

HOPE IT WILL HELP YOU :-)