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If population increases from 80 lakh to 100 lakh, what is the percentage growth?

Answer and explanation

Correct answer: 25 percent

Answer: B, 25 percent. First find the absolute increase: final population − initial population = 100 lakh − 80 lakh = 20 lakh. Percentage growth is calculated using the initial population as the denominator: percentage growth = (increase ÷ initial population) × 100. Therefore, (20 ÷ 80) × 100 = 0.25 × 100 = 25%. B is correct. A would result from treating 20 lakh as 20% without comparing it with the base. C incorrectly uses a different denominator or calculation. D uses the initial figure itself as a percentage and is not a growth calculation. The unit lakh cancels because both quantities use the same unit. Memory cue: percentage growth always uses increase divided by the original population, not the final population.

Related tags

Percentage GrowthPopulation CalculationInitial PopulationPopulation GrowthPopulationGeographyClass 9 Mcq

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