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If a population of 3 million grows by 5 percent annually for four consecutive years, what will it be approximately at the end of the fourth year?

Answer and explanation

Correct answer: 3.647 million

A constant annual growth rate produces compound growth because each year’s increase is added to the population base for the next year. Starting with 3 million and growing by 5 percent annually for four years gives \(3,000,000\times(1.05)^4\). The factor is raised to the fourth power because the increase occurs four consecutive times.

Since \(1.05^4\approx1.215506\), the final population is approximately 3,646,518, or 3.647 million. In lakh units, this is about 36.47 lakh, so option B is correct. Adding 5 percent four times gives only a rough simple estimate and misses the extra growth on earlier increases. Option D is too high for the stated rate and duration.

Related tags

Compound Population GrowthFour Year GrowthAnnual RatePopulation ProjectionPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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