prior to July 1, 1998 the interest rate is a variable rate applicable to each July 1-June 30 period, that equals the lesser of???(A) The bond equivalent rate of the 91-day Treasury bills auctioned at the final auction prior to the June 1 immediately preceding the July 1-June 30 period, plus 2.5 percent during the in-school, grace and deferment period and 3.10 percent during repayment; or(B) 8.25 p