(b) The reduced monthly benefit payable for life to a participant eligible under this section is the benefit calculated under section 3 of this chapter, multiplied by a percentage determined as follows: STEP ONE: From seven hundred eighty (780) months, which equals sixty-five (65) years, subtract the age of the participant at the participant's retirement date expressed in whole months (retirement age in months) and obtain a remainder (X).
STEP TWO:
(A) If the remainder (X) is less than or equal to sixty (60), multiply the remainder (X) times one-tenth percent (0.1%) and obtain a product (Y).(B) If the remainder (X) is greater than sixty (60), multiply five-twelfths percent (5/12%) times the difference obtained by subtracting sixty (60) from the remainder (X) and obtain a product. Add to this six percent (6%) and obtain a sum (Y). STEP THREE: From one hundred percent (100%) subtract the appropriate (Y). This equals the percentage used to determine the reduced monthly benefit.