The population of a village decreases at the rate of 20% per annum. If its popul

Question

The population of a village decreases at the rate of 20% per annum. If its population 2 years ago was 10,000, the present population is

Options:

A . 6400

B . 4600

C . 7600

D . 6000

Answer: Option A
Answer: (a)
Using Rule 17,
Present population = $10000(1 - 20/100)^2$
= $10000 × 4/5 × 4/5 = 6400$

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