CDS 2009 PYQ with Answer — 10% of the inhabitants of a certain city left that city. Later on 10%… | UPSC One

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CDS 2009 · Elementary Mathematics (CDS-II)Q84

Back to the full 2009 paper

2009 · Q84

10% of the inhabitants of a certain city left that city. Later on 10% of the remaining inhabitants of that city again left the city. What is the remaining percentage of population of that city?

Elementary MathematicsAlgebra

A80%
B4%
C6%
D81%

Explanation

0.9 × 0.9 = 81% remain.

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