Question

In a laboratory a bacterial culture develops itself once every 3 hours. If it's initial population is is 1,00,000, find its population after 12 hours. Also, calculate the percentage change in its population in an hour.
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Answer 1

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In this example, the bacteria divide every 20 minutes, and will therefore divide three times every hour, $\sf\dfrac{60}{20}= 3$

If the bacteria grow for six hours, each bacterium will divide 3 times per hour × 3 hours = 9 times.