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If the previous population was twenty lakh and the current population is twenty-five lakh, what is the growth percentage?

Answer and explanation

Correct answer: Twenty-five percent

Direct answer: B, twenty-five percent. Begin by finding the increase in population: current population − previous population = 25 lakh − 20 lakh = 5 lakh. Growth percentage compares this increase with the previous population, because the previous population is the starting base. Apply the formula: (increase ÷ previous population) × 100 = (5 ÷ 20) × 100 = one-fourth × 100 = 25%. A is wrong because 5 lakh is not 20% of 20 lakh; 20% would be 4 lakh. C is wrong because it mistakes the numerical increase, 5 lakh, for 5 percent. D is wrong because 50% of 20 lakh would be 10 lakh, twice the actual increase. Memory cue: always divide the change by the old value, then multiply by 100.

Related tags

Growth PercentagePopulation CalculationPercentage FormulaPopulation GrowthPopulationGeographyClass 9 Mcq

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