In 2000 , the CPI was 152.5% and the price of an economics textbook was $70.00 and a music CD was $16.00 . If the CPI was 172.3% in 2009 , 1) what was the price of the economics textbook in 2009 ? 2) What was the price of the music CD in 2009 dollars? 3) What is the inflation rate between 2000 and 2009 ?.