Tia P.

asked • 07/29/15

College algebra

In 1997, 0.309 million DVD players were sold. In 2006, the sales reached 20.037 million  Find the average rate of change in sales, in millions, per year. round answer to nearest hundredth. 

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Mark M. answered • 07/29/15

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rate = change of sales  /  change in years
rate = 20.037 million - 0.309 million / 9 years
rate = 19.728 million / 9 years
rate = 2.192 million / year
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David W.

... and rounded to the nearest hundredth (of a million/year), that is 2.19 million/year.
 
Note:  since the values given in the problem were already rounded to the nearest thousandth (of a million), it only makes sense that our answer be given rounded to a hundredth (of a million) because we can't make our result more accurate than the values given.
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07/29/15

Mark M.

Thank you for the elucidation.
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07/29/15

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