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If births are 2500, deaths are 1200, in-migration is 400 and out-migration is 900, what is total population change?

Answer and explanation

Correct answer: Increase of 800

Answer: A, an increase of 800. Solve in two clear stages. First find natural increase: births − deaths = 2,500 − 1,200 = 1,300. Next find net migration: in-migration − out-migration = 400 − 900 = −500. The minus sign means that 500 more people left than entered. Now add the two signed results: 1,300 + (−500) = 800. Therefore, the total population increases by 800. A is correct. B gives only the natural increase and ignores migration. C incorrectly adds all births and arrivals without subtracting deaths and departures. D gives the size of the net migration loss but ignores the larger natural increase, so it is not the total change. Memory cue: total change = (births − deaths) + (in-migration − out-migration).

Related tags

Population CalculationNatural IncreaseNet MigrationPopulation GrowthPopulationGeographyClass 9 Mcq

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