Question

2. In the new budget, the price of petrol has risen by 20%. By how much per cent
must a motorist reduce his consumption of petrol so that his expenditure on it
does not increase?​

Answer 1

Answer:

16.667%

Step-by-step explanation:

for such question there is a direct formula

if something has increased then expenditure has to be decreased by= (a/100+a)*100

if something has reduced then expenditure can be be increased by= (a/100-a)*100

Here 'a' is the percent increased or decreased for the commodity