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In an experiment, the population of bacteria is increasing at the rate of 100% every minute. The population is currently at 50 million.

How much was the population of bacteria 1 minute ago?

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well, we know is doubling every minute, because 100% of whatever is now is twice that much, so is really doubling. Now, if we know currently is 50 millions, well, hell a minute ago it was half that, because twice whatever that was a minute ago is 50 million, so half of it, it was 25 millions.

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