where
X is the change in the Alberta CPI, rounded to 3 decimal places;

A is the sum of the 12 individual Alberta CPI indexes for each month in the 12 month period ending on September 30 of the calendar year that ended before the commencement of the CPI adjustment year;

B is the sum of the 12 individual Alberta CPI indexes for each month in the 12 month period immediately preceding the 12 month period referred to in A.

(2)  The Minister, in consultation with the Minister responsible for the Financial Administration Act, shall determine the amount by which income support payments must be adjusted under section 2 if the Alberta CPI is not available for part or all of the CPI adjustment year for which the change in the Alberta CPI is being calculated.