Rock music accounted for 34.5% of the total sales of recorded music in 1995, and 22.8% of the total sales of recorded music in 2005. Find the average rate of change of the percentage of sales of rock music from 1995 to 2005.
Round to the nearest hundredth of a percent.

Question

Rock music accounted for 34.5% of the total sales of recorded music in 1995, and 22.8% of the total sales of recorded music in 2005. Find the average rate of change of the percentage of sales of rock music from 1995 to 2005.
Round to the nearest hundredth of a percent.

anonymous · Answer

Hi there. Any ideas?

anonymous · Answer

Do I just subtract 22.8% from 34.5% and divide the answer by 10?

anonymous · Answer

Yes, slope = Δy / Δx

anonymous · Answer

Wait....I just did that....and got 1.17, which is apparently wrong.

anonymous · Answer

-11.7% / 10 = -.0117

anonymous · Answer

Pay attention of decreasing percentage!

anonymous · Answer

Wait...no!

anonymous · Answer

That answer's apparently wrong too!

anonymous · Answer

(1995, 34.5% ) and ( 2005, 22.8%)
slope = Δy / Δx 
          =  ( 34.5% - 22.8%) / ( 1995 - 2005) 
          =     - 11.7% / 10
          =     - 1.17%

anonymous · Answer

Do you know keep the percentage or not?

anonymous · Answer

Okay..got it. No, I'm afraid not.

anonymous · Answer

Just give the answer -1.17% = -.0117

anonymous · Answer

Alright. Thank you a tremendous amount, Chlorophyll!

anonymous · Answer

Since you had showed you know the calculation, I didn't go into details at first :)