Multiple choice

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:

  1. 4600

  2. 6400

  3. 7600

  4. 6000
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When population decreases at 20% per annum, each year 80% remains. After 2 years: 10000 × 0.8 × 0.8 = 6400. The multiplier compounds annually (0.8² = 0.64), so 64% of the original population remains.

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