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If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a decrease of four times?

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    To me, without more data, it doesn't make sense. A decrease of 100% would mean it costs nothing.

    If the rate of decrease was constant over the 10 years, it would mean a decrease of 40% each year. Assuming it cost $100 originally:

    $100
    $60
    $36
    $21.60
    $12.96
    $7.78
    That is only after 5 years!

    Sorry that I cannot be of more help.

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