In the event a member leaves a position covered by the public system and within five years thereafter becomes employed in a position covered by the teacher system, or a member leaves the position covered by the teacher system and within five years thereafter becomes employed in a position covered by the public system, in either case, the following provisions shall apply.
(a) A member's reciprocal service credit in force shall be used to satisfy the service requirements for retirement under the state system from which he or she retires.
(b) If a member, who has reciprocal service credit in force, retires under the public system, he or she shall receive an annuity payable by the public system and an annuity payable by the teacher system. His or her public system annuity shall be based upon: (1) The portion of his or her reciprocal service credit acquired as a member of the public system; and (2) his or her public final average salary. The member's teacher system annuity shall be based upon: (1) The portion of his or her reciprocal service credit acquired as a member of the teacher system; and (2) his or her teachers' final average salary as provided by the teachers retirement act. His or her teacher system annuity shall begin as of the date he or she retires under the public system, but in no case prior to the date the member would have been eligible to retire under the teacher system if all his or her reciprocal service credit had been acquired as a member of the teacher system.
(c) If a member, who has reciprocal service credit in force, retires under the teacher system, he or she shall receive an annuity payable by the teacher system and an annuity payable by the public system. The member's teacher system annuity shall be based upon: (1) The portion of his or her reciprocal service credit acquired as a member of the teacher system; and (2) his or her teachers' final average salary as provided by the teachers retirement act. His or her public system annuity shall be based upon: (1) The portion of the reciprocal service credit acquired as a member of the public system; and (2) his or her public final average salary. His or her public system annuity shall begin as of the date he or she retired under the teacher system, but in no case prior to the date he or she would have been eligible to retire under the public system if all his or her reciprocal service credit had been acquired as a member of the public system.