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If births are 500, deaths are 400, and net migration is -200, what is the total population change?

Answer and explanation

Correct answer: Decrease of 100

Population change has two parts: natural change and migration change. Natural change equals births minus deaths. Here, births are 500 and deaths are 400, so natural increase is 100 people. Net migration is given as -200, and the negative sign means that 200 more people left than entered.

Total population change is natural increase plus net migration: \(500-400+(-200)=100-200=-100\). A negative result means the population decreased, not increased. Therefore option D, a decrease of 100, is correct. Choosing an increase of 100 would ignore migration, while choosing a decrease of 200 would ignore the natural increase of 100.

Related tags

Total Population ChangeNegative Net MigrationNatural IncreasePopulation DeclinePopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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