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The population of a city was 6.4 million at the beginning of a becade and rose to 8.1 million by the end of the decade. Assuming the rate of growth to be constant, the size of population in the middle of the decade was

[A].	6.25 million	[B].	6.75 million
[C].	7.25 million	[D].	7.75 million

Answer: Option C

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