(a) All persons now employed on a full-time basis in an administrative or clerical capacity by the Alabama High School Athletic Association may become members of the Teachers' Retirement System of Alabama within 90 days after October 1, 1967, subject to such rules and regulations as may be promulgated by the Board of Control of the Teachers' Retirement System of Alabama. Any person hereafter employed in an administrative or clerical capacity by the Alabama High School Athletic Association shall be deemed to be a "teacher" as defined in Section 16-25-1 and shall be entitled to the benefits thereof. Notwithstanding the provisions of this section and other sections of the Teachers' Retirement System law, it is provided that the Alabama High School Athletic Association shall pay to the retirement system the employer cost for coverage of its employees, such cost to be determined by an actuary employed by the Board of Control and under rules and regulations established by said board.
(b) Any person now employed as set out in subsection (a) of this section shall be entitled to receive credit for all service as a "teacher" or as an employee of the Alabama High School Athletic Association rendered by him prior to October 1, 1967; provided, that a sum equal to the total contributions which he would have made as a member during the period of such employment plus regular interest at four percent is paid within 90 days after October 1, 1967.