(1) Except as provided in section 35(4), the effective date of the 1980 amendatory act which added this section 70 shall be March 1, 1981.

    (2) An individual who has a current and unexhausted benefit year on March 1, 1981, shall have his or her weekly benefit rate and the maximum amount of benefits recomputed in accordance with the 1980 amendatory act which added this section 70 with respect to any week of unemployment beginning March 1, 1981, on that portion of his or her benefit rights not exhausted before March 1, 1981, but his or her weekly benefit rate and maximum amount of benefits established and not exhausted before March 1, 1981, shall not be subject to reduction or elimination by the recomputation.

    (3) An individual who is eligible for 1 or more weeks of extended benefits under section 64 on or after March 1, 1981, shall receive the increase in benefits provided in section 68 with respect to each such week. Any increase in benefits over those provided in section 64 shall be deemed supplemental benefits and shall be payable at an individual’s weekly supplemental benefit rate. This rate shall be the difference between a weekly extended benefit rate that could have been established if the increase in benefits provided in section 68 had been in effect during the individual’s entire benefit year and his or her weekly extended benefit rate established under section 64. Supplemental benefits paid under this subsection based on services performed for employers liable for contributions on a contributory basis shall be charged to the nonchargeable benefits account. Supplemental benefits paid under this subsection based on services performed for reimbursing employers shall be reimbursed to the commission by those reimbursing employers.