Question

if the price of kerosene is raised by 10%, by how much percent must a person reduce his consumption of kerosene so that his expenditure remains the same.

Answer 1

We have,
kerosene rate is increased by 10%.
So let the current price of kerosene be x.
Increased price = x+(10/100*x)

Let the persons consumption be y.
So in order to keep his expenditure he must reduce his consumption also by 10%.


Mathematically,
x+(10/100*x)=y-(10/100*y)

Hence,
The person must reduce his consumption by 10%.

Hope it helps!

Answer 2

Answer:

10/110*100=9(1/11) % or 9.09%