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Math Help - Geometric Sequence

  1. #1
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    Smile Geometric Sequence

    Luke purchased an automobile for $5000 and the value of the automobile decreases by 20% each year. How many years from the date of purchase will the value of the automobile be $3200 ?

    Thank you.
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  2. #2
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    Quote Originally Posted by sahip View Post
    Luke purchased an automobile for $5000 and the value of the automobile decreases by 20% each year. How many years from the date of purchase will the value of the automobile be $3200 ?

    Thank you.
    3200 = 5000(0.8)^t

    solve for t in years
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