the State’s Medicaid Buy-In Option during the preceding fiscal year if the regular FMAP applicable to such assistance were increased (subject to subparagraph (C)) as follows: (i) Two percentage points for achieving the minimum 10 percent reduction in the mandatory benchmark described in paragraph (3)(A) during the preceding fiscal year (or 2.4 percentage points for achieving a reduction of at least 20 percent (but not more than 30 percent), 2.6 percentage points for achieving a reduction of at least 30 percent (but not more than 40 percent), and 2.8 percentage points for achieving a reduction of at least 40 percent). (ii) Two percentage points for achieving the minimum 10 percent increase in the mandatory benchmark described in paragraph (3)(B) during the preceding fiscal year (or 2.4 percentage points for achieving an increase of at least 20 percent (but not more than 30 percent), 2.6 percentage points for achieving an increase of at least 30 percent (but not more than 40 percent), and 2.8 percentage points for achieving an increase of at least 40 percent). (iii) One-half percentage points for each additional benchmark described in paragraph (4) that the State achieves during the preceding fiscal year. (C) Limitations In no case may— (i) the increase in the regular FMAP resulting from the application of subparagraph (B) for any Medicaid Buy-In State exceed 100 percent of the costs for providing medical assistance to individuals enrolled in the Medicaid Buy-In Option with respect to each fiscal year of the 5-fiscal-year period in which the demonstration project is conducted