(a) A cost of living adjustment to the monthly benefit of a member of the 1925 fund, 1937 fund, or 1953 fund is determined in STEP FOUR of the following formula: STEP ONE: Calculate a percentage by dividing:
(A) the amount of any increase in the salary of a first class officer or firefighter, whichever is applicable; by(B) the prior year's salary of a first class officer or firefighter, whichever is applicable.STEP TWO: Add:
(A) the member's DROP frozen benefit; and(B) the amount of any prior cost of living adjustments calculated under this section.STEP THREE: Multiply the percentage determined under STEP ONE by the sum determined under STEP TWO.
STEP FOUR: Add the product determined under STEP THREE to the sum determined under STEP TWO.