; and (II) averaging the percentages under subclause (I). (2) Decreased Federal share for areas blocking equitable growth (A) In general The Federal share payable on account of any project under this chapter carried out in an area governed by a jurisdiction blocking equitable growth and not governed by any jurisdiction encouraging equitable growth shall be decreased by the greater of— (i) 10 percent; or (ii) the percentage calculated in subparagraph (B). (B) Calculation (i) In general Except as provided in clause (ii), the percentage in subparagraph (A)(ii) shall be the percentage of the project (calculated by square mileage) that is governed by a jurisdiction blocking equitable growth. (ii) Multiple jurisdictions For any project carried out in an area governed by multiple jurisdictions blocking equitable growth and not governed by any jurisdiction encouraging equitable growth, the percentage in subparagraph (A)(ii) shall be calculated by— (I) determining the percentage under clause (i) for each such jurisdiction; and (II) averaging the percentages under subclause (I). (3) Special rule for mixed coverage of jurisdictions encouraging and blocking equitable growth (A) In general For any project under this chapter carried out in an area any portion of which is governed by at least 1 jurisdiction encouraging equitable growth and at least 1 jurisdiction blocking equitable growth, the Federal share payable on account of such project shall be— (i) for any percentage under subparagraph (B)(ii)(I), increased, up to the total cost of the project, by the percentage under such subparagraph; (ii) for any percentage under subparagraph (B)(ii)(II), decreased by the percentage under such subparagraph; or (iii) for any percentage under subparagraph (B)(ii)(III), neither increased or decreased. (B) Calculation The percentages in subparagraph (A) shall be calculated by— (i) determining the percentages under paragraphs (1)(B) and (2)(B)