Rap/hip-hop music accounted for 11.7% of the total sales of recorded music in 1998, and 13.9% of the total sales of recorded music in 2006 . Find the average rate of change of the percentage of sales of rap/hip-hop music from 1998 to 2006 .
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 what percent?

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(13.9 - 11.7)/(2006 - 1998) = 2.2/8 = 0.275 = 27.5 %

wait.. 0.275 = 0.28 percent

let me chec

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