(a) to any person who becomes a city employee after the enactment of this act and who becomes a member of the retirement system created hereby, and pay into the retirement system not less than 5% or more than 7%, as determined from time to time by the commission, of the amount of said salary, provided such employee was under 35 years of age at the time of his permanent appointment; provided, however, that any person entering the service of the municipality and becoming a member of said retirement system after reaching the age of 35 years and any present city employee not now a member of any of the 3 funds which are being merged into the retirement system created hereby, and who qualifies for membership under the provisions of this act and who was over 35 years of age at the time he received his permanent appointment, shall contribute to and there shall be deducted from his annual salary the following percentages, depending upon the age of said employee at the time of his permanent employment, as shall be determined from time to time by the commission: AGE PERCENTAGE OF DEDUCTIONS
Over 35 years and under 36 years .....
not less than 5 1/4% or more than 7 1/4%
Over 36 years and under 37 years .....
not less than 5 1/2% or more than 7 1/2%
Over 37 years and under 38 years .....
not less than 5 3/4% or more than 7 3/4%
Over 38 years and under 39 years .....
not less than 6% or more than 8%
Over 39 years and under 40 years .....
not less than 6 1/4% or more than 8 1/4%
Over 40 years and under 41 years .....
not less than 6 1/2% or more than 8 1/2%
Over 41 years and under 42 years .....
not less than 6 3/4% or more than 8 3/4%
Over 42 years and under 43 years .....
not less than 7% or more than 9%
Over 43 years and under 44 years .....
not less than 7 1/4% or more than 9 1/4%
Over 44 years and under 45 years .....
not less than 7 1/2% or more than 9 1/2%