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If an area's population increases from 10 lakh to 12 lakh what is the growth percentage?

Answer and explanation

Correct answer: 20 percent

Correct answer: B, 20 percent. First find the absolute increase: final population minus initial population equals 12 lakh minus 10 lakh, or 2 lakh. Next compare that increase with the initial population, because percentage growth is calculated from the starting value. The formula is: growth percentage = (increase ÷ initial population) × 100. Therefore, (2 ÷ 10) × 100 = 20 percent. A is wrong because 2 lakh is one-fifth, not one-tenth, of 10 lakh. C and D are also too large and do not result from the formula. Memory cue: subtract first, then divide by the original number—not the final number.

Related tags

Growth PercentagePopulation CalculationPercentage FormulaPopulation GrowthPopulationGeographyClass 9 Mcq

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