ROSF = the definition
ROSF = the. Run Off Servicer's Fee" for such Undivided Interest at such time, determined as an amount equal to (x) the related Purchasers' Investment, times (y) the percentage per annum set forth in clause (i) of the definition of "Servicer's Fee", or, if Servicer's Fee is calculated pursuant to clause (ii) of such definition, the percentage determined for each day by dividing the Purchasers' Investment at the close of business on such day by the amount of Servicer's Fee accrued for such day, multiplying the quotient by 1/360 and expressing the product as a percentage, times (z) a fraction the numerator of which is the number of days equal to the then Adjusted Average Maturity, and the denominator of which is 360 days.