All computations of interest and of fees (other than flat fees) shall be made by the Bank on the basis of a year of 360 days for the actual number of days (including the first day but excluding the last day) occurring in the period for which such interest and fees are payable. Each determination of an interest rate or the amount of a fee hereunder shall be made by the Bank and shall be conclusive, binding and final for all purposes, absent manifest error. All fees shall be (a) deemed to be an Obligation, (b) fully earned on the earlier of (i) the date specified such fee is earned or (ii) the date such fee is payable and (c) nonrefundable and shall not be subject to reduction, rebate or proration whatsoever.