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The population of a city 3 years ago was 1,28,000. If it decreased by 5% on every year, then the present population of the city is:


1. 786546
2. 456458
3. 887766
4. 109744

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Correct Answer - Option 4 : 109744

Population of the city 3 years ago = P = 128000 and n = 3

And, the decreasing percentage = R = 5%

The present population = P x (1 - R/100)n

= 128000 x (1 - 5/100)3

= 128000 x 19/20 x 19/20 x 19/20

= 16 x 6859 = 109744.

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