In applying this part (including subsection (i) and section 1395 l (b) of this title),
(i)#
the monthly actuarial rate for enrollees age 65 and over for 2020; plus
(ii)#
25 percent of the difference between such rate for 2020 and the preliminary monthly actuarial rate for enrollees age 65 and over for 2021 (as estimated under subparagraph (B)).