Where,
Cr = The revised interest rate cap;
Co = The original interest rate cap at the time of prepayment;
Ai = The average interest rate actually charged in the ith period;
Ti = Length of the ith period expressed in years;
n = The number of years that have elapsed since the initial prepayment;
J = The initial term of the private loan, at the time of prepayment;
Subject to the constraint that A1 must be less or equal to Co).
7 C.F.R. §1786.28