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mathsucksalot123 Group Title

Rock music accounted for 30.5% of the total sales of recorded music in 1999 , and 20.4% of the total sales of recorded music in 2009 . Find the average rate of change of the percentage of sales of rock music from 1999 to 2009 . Round to the nearest hundredth of a percent. Note that the percentage sign is already given in the answer, so you do not need to enter it. The average rate of change is .

  • 2 years ago
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  1. helpingtutors Group Title
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    (30.5 - 20.4)/10 = 10.1/10 = 1.01

    • 2 years ago
  2. mathsucksalot123 Group Title
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    i tried that. it says its wrong :(

    • 2 years ago
  3. satellite73 Group Title
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    that is because your answer should be negative. sales declined over the ten year period

    • 2 years ago
  4. satellite73 Group Title
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    \[\frac{30.5-20.4}{1999-2009}=\frac{10.1}{-10}\]

    • 2 years ago
  5. mathsucksalot123 Group Title
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    thanks

    • 2 years ago
  6. satellite73 Group Title
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    yw

    • 2 years ago
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