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If an area's previous population was seventy-five lakh and current population is ninety lakh, what is the growth rate?

Answer and explanation

Correct answer: Twenty percent

Direct answer: C, twenty percent. Begin by finding the increase: current population minus previous population equals 90 lakh − 75 lakh = 15 lakh. Percentage growth is calculated against the previous population, because that is the starting base. Therefore growth rate = (15 ÷ 75) × 100 = 20%. Another check is that 15 is one-fifth of 75, and one-fifth equals 20%. A is not obtained from the data. B treats the increase of 15 lakh as if it were automatically 15 percent, which is a common mistake; lakh is a number unit, not a percentage. D is also inconsistent with the calculation. The important rule is: percentage growth = increase ÷ original population × 100.

Related tags

Growth RatePercentage CalculationPopulation IncreaseBase PopulationPopulation GrowthPopulationGeographyClass 9 Mcq

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