Question

The price of petrol is increased by 10% .To keep the expenditure same ,it's consumption must be reduced by how much %?

Answer 1

Answer:

~ 9.1 %

Step-by-step explanation:

exp = price × consump

hence...

price & consump are inversely proportional

now.....

price1 : price2 : : consump2 : consump1

100 : 110 : : consump2 : consump1

100 ( consump1) = 110 ( consump2)

consump2 = 100 (consump1)/110

consump2 % = (consump1 - consump2) × 100/ consump1

= 10 × 100/110

~ 9.1 %