Question

if the price of petrol is increased by 30% by how much percent a car owner must reduce the consumption in order to maintain the same budget

Answer 1

There is simple and direct formula for this, in case of increment use the formula given below to calculate the reduced consumption in percentage. Here R= rate of increment.

{R/(100+R)}*100

So putting the value of R=30 we would get around 23.07%

Answer 2

Given

• 30 percentage increase in petrol price

To find

• the decrease in conception so as to maintain the budget same

Solution

we are provided with the percentage increase in the price of petrol and are asked to find the decrease that should be made in the conception so that the budget would be same as before.

let us assume the price of petrol before the increment is 100.

therefore 30% is increase would make the price,

100 + (30/100)× 100

or, 100 + 30

or, 130

the decreasement that should be made to maintain the budget,

[(130-100)/130]× 100

or, (30/130)× 100

or, 0.2307× 100

or, 23.07℅