571. For the purposes of the fiscal period 1980, the treasurer of the Communauté urbaine de Montréal, when making the final apportionment under section 220 of the Act respecting the Communauté urbaine de Montréal, replaced by section 420, shall take into account, in addition to the particulars mentioned in that section, the alterations made to the roll in accordance with section 531, to the extent that those alterations have effect on 1 January 1980.