The cost increase at the greatest average rate in the time interval from 2006 to 2012 will be 1.833.
The average rapid change describes how quickly one quantity changes in comparison to another.
The table is shown.
It is clear that in six years, the rate of the cost of mailing a postcard will be 11. Then the average rate will be
Average rate = 11/ 6
Average rate = 1.833
Thus, the cost increase at the greatest average rate in the time interval from 2006 to 2012 will be 1.833.
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