Q. 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 :
Answer: 6400
Notes: Present Population $latex = 10000\left ( 1-\frac{20}{100} \right )^{2}&s=1$ $latex = 10000\times \frac{4}{5}\times \frac{4}{5} = 6400&s=1$ Hence option [C] is correct answer.

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