$7,500 Was Borrowed for a Four-Year Term at 9% Compounded

$7,500 was borrowed for a four-year term at 9% compounded quarterly. The terms of the loan allow prepayment of the loan based on discounting the loan's maturity value at 7% compounded quarterly. How long (to the nearest day) before the maturity date was the loan prepaid if the payout amount was $9,380.24? For the purpose of determining the number of days in a partial calendar quarter, assume that a full quarter has 91 days.