Question

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 .

Answer 1

1.01

Answer 2

it says that is wrong

Answer 3

rate of change = change in %/ total time.

Answer 4

thanks

Answer 5

-1.01

Answer 6

10.1% over 10 years. should be 1.01% a year. probably needs to be -1.01%

Answer 7

the slope will be in -ve.