9. In the case provided for in subparagraph 2 of the first paragraph of section 2, the community shall fix
(1) a single rate by which the result obtained, for each municipality concerned, is multiplied following the application of any percentage fixed under section 7; and
(2) a single rate by which the tax base, determined in accordance with section 3, is multiplied for each municipality concerned.
Subject to section 10, the sum of the products resulting from the multiplications provided for in subparagraphs 1 and 2 of the first paragraph constitutes the amount of the municipality’s contribution. If no growth in the tax base has been measured for the municipality, only the product resulting from the multiplication provided for in subparagraph 2 constitutes, subject to section 10, the amount of the municipality’s contribution.
The rates referred to in subparagraphs 1 and 2 of the first paragraph must be fixed in such a way that at least half the sum equal to all the contributions of the municipalities for the current fiscal year is derived from the products of the multiplication provided for in subparagraph 1.