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If an area has two lakh births, one lakh deaths and net migration of minus one and a half lakh, what will be the total change?

Answer and explanation

Correct answer: Decrease of half lakh

Answer: D, a decrease of half lakh. First calculate natural increase: births − deaths = 2 lakh − 1 lakh = 1 lakh. Next include net migration. A net migration of minus 1.5 lakh means the area lost 1.5 lakh more people through migration than it gained. Total change = natural increase + net migration = 1 lakh + (−1.5 lakh) = −0.5 lakh. The negative sign means a decrease, and 0.5 lakh is half a lakh. A incorrectly adds the magnitudes without using the negative sign. B reports only natural increase and ignores migration. C would be correct only if the positive natural increase exactly balanced the negative migration. D correctly includes both parts. Memory cue: keep the sign of net migration until the final step.

Related tags

Total GrowthNet MigrationNatural IncreaseSigned CalculationProcesses Of Population ChangePopulationGeographyClass 9 Mcq

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