Question
Bangalore's Metro urban planners expect the city's population to increase by 10% per year over the next two years. If that projection were to come true, the population two years from now would be exactly double the population of one year ago. Which of the following is closest to the percent population increase in Bangalore over the last year?
Answer: Option D
:
D
If we assume that today's population is 100, next year it would be 1.1 × 100 = 110, and the following year it would be 1.1× 110 = 121. If this is double the population of one year ago, the population at that time must have been 0.5× 121 = 60.5. Because the problem seeks the "closest” answer choice, we can round 60.5 to 60.
In this scenario, the population has increased from 60 to 100 over the last year, a net increase of 40 residents. To determine the percentage increase over the last year, divide the net increase by the initial population: , or roughly 67%.
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:
D
If we assume that today's population is 100, next year it would be 1.1 × 100 = 110, and the following year it would be 1.1× 110 = 121. If this is double the population of one year ago, the population at that time must have been 0.5× 121 = 60.5. Because the problem seeks the "closest” answer choice, we can round 60.5 to 60.
In this scenario, the population has increased from 60 to 100 over the last year, a net increase of 40 residents. To determine the percentage increase over the last year, divide the net increase by the initial population: , or roughly 67%.
Was this answer helpful ?
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