Entry Test MCQ :: Percentage

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If the price of the coal be raised by 10% by how much percent a man must reduce its consumption so as not to increase his expenditure.

[A].	30	[B].	11
[C].	9 1?11%	[D].	12.50%

Answer: Option C

Nawaz said:

Let consumption=x, Price=p, then expenditure= px. After increase, price=(11/10)p, let consumption=y then expenditure=(11p/10)y. Now (11p/10)y=px gives y=(10/11)x. So decrease=x-(10/11)x=(1/11)x. Therefore %age decrease in expenditrue =(1/11)100=9.09%