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Math Help - Decay rate

  1. #1
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    Joined
    Nov 2009
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    2

    Decay rate

    Hi

    I have to solve this problem:

    ABC Co is looking into promoting sales of their shares, which are expected to result in extra sales. After the promotion, the extra
    sales reach 4000 and will then start decaying at a rate of −800e^(−0.2t) , where t is time in days after the promotion campaign. How many extra sales are obtained 40 days after the close of the campaign?

    Please advise!
    Many thanks
    ola
    Last edited by leslolas; November 13th 2009 at 08:59 AM.
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