578. For the purposes of sections 129 of the Act respecting the Communauté urbaine de Québec, 220 of the Act respecting the Communauté urbaine de Montréal and 193 of the Act respecting the Communauté régionale de l’Outaouais, amended or replaced by sections 403, 420 and 438, respectively, when a municipal corporation that is a member of the community has no roll of rental values, the fiscal potential of that municipal corporation is equal to the sum of the amounts computed in accordance with subparagraphs 1 and 2:(1) the amount computed under subparagraph 1 of the third paragraph of section 129 above mentioned, subparagraph 1 of the third paragraph of section 220 above mentioned, or subparagraph 1 of the second paragraph of section 193 above mentioned; and
(2) the amount obtained by multiplying by the factor established by the Minister for the roll of the municipal corporation under section 264 and by the median proportion determined as for each municipal corporation in the community that has a roll of rental values.
For the purposes of subparagraph 2 of the first paragraph,