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:
a. aggregate price level index.
b. producer price index​ (ppi).
c. consumer price index​ (cpi).
d. inflation rate index. suppose the​ economy's consumer price index​ (cpi) in 2008 was 188188 and the cpi in 2009 was 197197. the inflation rate over the period from​ 2008-2009 was equal to nothing​%. ​(enter your response rounded to one decimal​ place.)?