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If a population increases from 40 lakh to 50 lakh, what is the percentage growth?

Answer and explanation

Correct answer: 25 percent

Answer: B, 25 percent. Percentage growth is calculated using the initial population as the base, not the final population. First find the absolute increase: 50 lakh − 40 lakh = 10 lakh. Next divide this increase by the initial population: 10 ÷ 40 = 0.25. Finally multiply by 100: 0.25 × 100 = 25%. Therefore, the population has grown by 25 percent. A is incorrect because 20% would result from using an unsuitable comparison rather than the correct initial base. B is correct because it follows the standard formula: percentage growth = (increase ÷ initial population) × 100. C is incorrect because 40 lakh is the starting amount, not the percentage increase. D is incorrect because 50 lakh is the final population, not the percentage growth. A useful memory cue is: subtract first, then divide by the starting value, and multiply by 100.

Related tags

Growth PercentageInitial PopulationPopulation CalculationPopulation GrowthPopulationGeographyClass 9 Mcq

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