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A country has a population of 120 million and an annual growth rate of 0.85 percent. Approximately how much will it grow in one year by simple calculation?

Answer and explanation

Correct answer: 1020000

To calculate a one-year increase, multiply the population by the growth rate written as a decimal. A population of 120 million is 120,000,000 people, and 0.85 percent is \(0.85\div100=0.0085\). Thus the increase is \(120000000\times0.0085=1020000\). The correct choice is B, 1,020,000 people, or about 1.02 million.

This is a simple one-year estimate. It applies the stated rate to the starting population and does not include compounding or changes during the year. Although 0.85 percent looks small, it is applied to a very large base. Option A is too low, while 1.2 million would correspond to a 1 percent increase in 120 million. The units are people, so the result represents additional population, not a percentage.

Related tags

Annual Growth RatePopulation BaseAbsolute IncreasePercentage CalculationPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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