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Today, 21:10

In 1988 a postage stamp cost $.27. In 1992 a postage stamp cost $.31. Find the average rate of change in the postage. Answer in units of cents/year.

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  1. Today, 21:51
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    It changed by $.04 in 4 years.

    $.04 / 4 = $.01

    The stamp changed by 1 cent/year
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