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03 Oct 2019, 05:38
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D
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If the population of Dhaka doubles every 10 years, how many times the population of the city will be in the year X+100 as compared to the years X?
A. 100
B. 200
C. 1,000
D. 1,024
E. 1,990
A. 100
B. 200
C. 1,000
D. 1,024
E. 1,990
03 Oct 2019, 06:00
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Bunuel
Population doubles after every 10 years
—> Increase is in GP series
Let the population in year X = a
After 10 years = \(a(2)^{10}\) = 1024a
—> Population increased by 1024 times
IMO Option D
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03 Oct 2019, 06:01
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If the population doubles each 10 years, to count the amount of times it will double in 100 years, we can use the compound interest formula:
(1+100%)^10=2^10=1024
Option D
(1+100%)^10=2^10=1024
Option D
