(a) All municipal retirees of the town of North Kingstown and the beneficiaries of municipal retirees of the town of North Kingstown are given a one-time percentage increase to their original retirement benefit in multiples of two percent (2%) as follows up to a maximum of twenty percent (20%).
(b) The additional percentage is incorporated into the recipients’ monthly benefit retroactive to July 1, 1990.
(c) The provisions of this section are not applicable to any employees who retired under the provisions of chapter 21.2 of this title.