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Math Help - Gross Annual Earnings

  1. #1
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    Gross Annual Earnings

    Gross annual earnings of a certain company A(t)=0.1t^2+10t+20 thousand dollars in t years afters its formation in 2000.

    A) At what rate were the gross annual earnings of the company growing with respect to time in 2004?

    B) At what percentage rate were the gross annual earnings growing with respect to time in 2004?

    the rate vs percentage rate confuses me?
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  2. #2
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    Quote Originally Posted by jascalc View Post
    Gross annual earnings of a certain company A(t)=0.1t^2+10t+20 thousand dollars in t years afters its formation in 2000.

    A) At what rate were the gross annual earnings of the company growing with respect to time in 2004?

    B) At what percentage rate were the gross annual earnings growing with respect to time in 2004?

    the rate vs percentage rate confuses me?
    A) you want \frac{d}{dt} A(t) thousands of dollars per year

    B) you want \frac{\left[\frac{d}{dt} A(t)\right]}{A(t)}\times 100 \% per year

    where t=4

    CB
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