Calculate the inflation rate between
i) December of 2007 and December of 2006.
ii) November of 2007 and November of 2005 (cumulative
over 2 years)
iii) October of 2008 and the corresponding month of
base period. (cumulative since 2002)

Does anyone know what I need to do when he says "cumulative over 2years" and when he says to calculate the inflation from Oct 08 withthe corresponding month of base period?

Obviously the first one is going to be (112.6/109.9-1)x100 with mygiven values, but I don't know what it even means when he says tocalculate the rate when cumulative.