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30. The population of a bacterial culture was 5000 bacteria after 20 min and 40 000 bacteria after 1 h. a) After how many

30. The population of a bacterial culture was 5000 bacteria after 20 min and 40 000 bacteria after 1 h. a) After how many minutes will the population reach 250 000 bacteria? [3 marks] b) Find the rate of growth after 20 min. Express your answer as bacteria per hour. [3 marks]

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