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If previous population is one crore fifty lakh and current population is one crore eighty lakh, what is the growth rate?

Answer and explanation

Correct answer: Twenty percent

The direct answer is B: twenty percent. Growth rate is calculated using the initial or previous population as the base: growth rate = (current population − previous population) ÷ previous population × 100. The increase is 1 crore 80 lakh − 1 crore 50 lakh = 30 lakh. Convert both values to lakh: previous population = 150 lakh and increase = 30 lakh. Therefore, growth rate = (30 ÷ 150) × 100 = 20%. A is wrong because 30 lakh is not 10% of 150 lakh. C is wrong because it treats the increase as 30% merely because the increase is 30 lakh. D is wrong because 30 is not half of 150. The denominator must be the previous population, not the current population. Memory cue: percentage growth always compares the increase with the starting value.

Related tags

Growth RatePercentage CalculationPopulation ArithmeticPopulation GrowthPopulationGeographyClass 9 Mcq

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