Teachers who have been granted a leave of absence, maternity, paternity and/or parental leave and who are eligible to continue to participate during their absence in group plans, shall make premium payments under such plans. The teacher upon commencing the leave of absence shall make arrangements to provide to the Division with post-dated cheques sufficient to pay the premiums for the period of the leave of absence. The Division shall make premium payments under the plans on behalf of the teacher during the authorized leave. In the event of a rate change in any of the plans during the duration of the leave the Division shall inform the teacher of the additional sum of money necessitated by the change in rates. The teacher shall forward such sum necessitated by the change in rate.