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The population of a village decreases at the rate of 20% per annum. If its population 2 years ago was 10000, the present population is :

August 30, 2016 Quiz Questions

The population of a village decreases at the rate of 20% per annum. If its population 2 years ago was 10000, the present population is :
[A]4600
[B]6000
[C]6400
[D]7600

6400
Present Population
= 10000\left ( 1-\frac{20}{100} \right )^{2}
= 10000\times \frac{4}{5}\times \frac{4}{5} = 6400
Hence option [C] is correct answer.

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