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Exponential growth and decay by percentage

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Now Playing:Exponential growth and decay by percentage– Example 1
Examples
  1. exponential growth/decay by percentage

    The population of rabbits is increasing by 70% every 6 months.
    Presently there are 500 rabits. How many years will it take for
    the population to reach 1,000,000?
    Solving exponential equations using exponent rules
    Jump to:NotesPrerequisitesRelated
    Notes
    Exponential growth/decay rates can be presented in percentages. We will work on questions of this kind in this lesson.
    exponential growth/decay: Af=Ai(f)timeperiod { A_f = A_i (f)^{time\over period}}

    Af {A_f} : final amount
    Ai {A_i} : initial amount
    f {f }
    : growth/decay factor
    half-time→f=12 \to f = {1\over 2}
    triple
    →f=3\to f = {3}
    ten-fold
    →f=10 \to f = {10}
    increase by 10%→f=(1+10100)=1.1 \to f = {({1 + {10\over 100}}) } { = 1.1}
    decrease by 8%→f=(1−8100)=0.92 \to f = {({1 - {8\over 100}}) } { = 0.92}
    time {time} : total time given
    period {period} : every length of time