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    N(t) = 400/(1 + 399e^-0.08t) After how many hours is the rumor spreading fastest?

    A rumor spreads among a group of 400 people. The number of people who have heard the rumor after t hours is given by: N(t) = 400/(1 + 399e^-0.08t) After how many hours is the rumor spreading fastest?
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