2008-2009 was equal to what percent?

What index is used to measure the average prices paid by a typical family? An average of the prices of the goods and services purchased by a typical family is the: O A. aggregate price level index. B. consumer price index (CPI). O C. producer price index (PPI). O D. inflation rate index. Suppose the economy's consumer price index (CPI) in 2008 was 185 and the CPI in 2009 was 198. The inflation rate over the period from 2008-2009 was equal to | %. (Enter your response rounded to one decimal place.)