In a liquid culture, the number of bacteria grows at a proportional rate depending on the number of cells present. At the start, there are 2 000 cells present in the culture. After 4 hours, there are 25 000 bacteria. If this unlimited growth is constant each time, what is the doubling time of the bacteria?   a. 35.4 minutes b. 36.4 minutes c. 37.4 minutes d. 38.4 minutes

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