The cpi for "all items" was 236.119 in march 2015, and 238.132 in march 2016. over this period, the rate of inflation as measured by the rate of change of the cpi was
I think the rate of inflation would be 238.132/236.119 or 1%/year so the answer is derived by dividing the cpi for March 2016 by the cpi for March 2015.
