Consider the constant rate of decrease of a certain microorganism. At the start, there are 10 000 microorganisms in a certain place. After 20 seconds, the population decreased to 6 000. If the number of microorganisms is directly proportional to the constant rate of decay and such a decrease in number continues at the same rate, how many microorganisms will there be after 30 seconds?    a. 4,646 b. 4,647 c. 4,648 d. 4,649

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