Question

the price of petrol is increased by 15% . find by how much percent a man must reduce his consumption so as not to increase his expenditure.​

Answer 1

Answer:

100\15=60 ok this is the correct answer ?

Answer 2

Answer:

13.043478260869%

Step-by-step explanation:

Let us assume the initial consumption was Y lit.

And the initial price of petrol was X rupees.

So, initial expenditure=Y×X

So , according to question, the new price of petrol will be

X/100×115=X×23/20

Let reduced consumption be =A

Then,

(X×23/20)×A=Y×X

=>A = Y×20/23

And A in percentage = 86.956521739130% of Y

So new consumption = Y×20/23 or 86.956521739130%

Hence ,a man should decrease his consumption by about (100- 20×100/23) %=13.043478260869%