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A country has a population of 20 million and a natural increase rate of 12 per thousand. If migration is zero, what is the approximate natural increase in one year?

Answer and explanation

Correct answer: 240000

A natural increase rate of 12 per thousand means that 12 people are added naturally for every 1,000 people in one year. The population is 20 million, or 20,000,000. Therefore the natural increase is \(20{,}000{,}000\times\frac{12}{1000}=240{,}000\) people. Since migration is zero, this is also the total population increase for the year. Option C is correct.

The rate must be converted from per thousand into a fraction before multiplying. Dividing by 1,000 gives 0.012, or 1.2%; multiplying that by 20 million gives 240,000. The answer is not 12,000 because the base is much larger than one million, and it is not 1,200,000 because that would use a much higher rate. The result is approximate because the rate is stated as an annual demographic rate.

Related tags

Natural Increase CalculationPer Thousand RatePopulation BaseDemography MathsPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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