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In a culture, the bacteria count is 1,00...

In a culture, the bacteria count is 1,00,000. The number is increased by 20% in 3 hours. In how many hours will the count reach 2,00,000, if the rate of growth of bacteria is proportional to the number present?

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The correct Answer is:
`(3log2)/(log((12)/(10)))`
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