1.

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»

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!


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