a. Any member of the police and fire retirement system, who has not by voluntary election on or after April first, nineteen hundred sixty-seven withdrawn the excess contributions authorized by subdivision d of this section, by written notice duly acknowledged and filed with the comptroller on or before December thirty-first, nineteen hundred sixty-seven or within one year after he or she last became a member, whichever is later, may elect to contribute pursuant to this section on the basis of retirement at age fifty-five. After such election the member shall contribute pursuant to this section at the higher rate determined in accordance with this subdivision . Such higher rate shall be determined by the actuary upon the basis of tables adopted by the comptroller and regular interest. Such higher rate shall consist of the member's rate of normal contribution plus an additional rate. Such higher rate shall be computed as the constant proportion of annual compensation which, when deducted from each payment of such member's prospective earnable compensation from the time when he or she last became a member until he or she shall attain age fifty-five, would provide, at such latter time, an annuity equal to one-one hundred twentieth of his or her final average salary for each year of member service rendered or which he or she will have rendered prior to his or her attainment of age fifty-five and for which he or she shall be entitled to credit. Such higher rate of contribution of a member who is over age fifty-four, at the time of his or her last becoming a member, shall be the same as if his or her age were fifty-four. Where a member elects to contribute pursuant to this section, contributions at such higher rate shall be made from May fifteenth, nineteen hundred sixty-seven or from the date he or she last became a member, whichever is later. Such member's rate of contribution pursuant to this section shall be appropriately reduced pursuant to section three hundred seventy-a of this article for such period of time as his employer contributes pursuant to such section toward pensions-providing-for-increased-take-home-pay provided, however, that such member may by written notice duly acknowledged and filed with the comptroller make an election to waive such reduction as provided by subdivision j of section three hundred twenty-one of this article. One year or more after the filing thereof, a member may withdraw any such election by written notice duly acknowledged and filed with the comptroller.