Posted by **Laura** on Sunday, October 13, 2013 at 9:39pm.

cost in 2005 is 15.00

cost on 2009 is 20.50

Consumer price index (20.50/15.00)x100=137

I understand that part but my professor said to measure inflation he gave the answer 37% divide 37/4=9.25%

4 number of years

9.25% annual rate inflation

how did he get 37 I am confused

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