All interest, as well as fees and other charges calculated on a per annum basis, shall be computed for the actual days elapsed, based on a year of 365 days with respect to SIBOR Loans and 360 days with respect to all other Obligations. Each determination by Agent of any interest, fees or interest rate hereunder shall be final, conclusive and binding for all purposes, absent manifest error. All fees shall be fully earned when due and shall not be subject to rebate, refund or proration. All fees payable under Section  3.2 are compensation for services and are not, and shall not be deemed to be, interest or any other charge for the use, forbearance or detention of money. A certificate as to amounts payable by Borrowers under Section  3.4, 3.6, 3.7, 3.9 or 5.9 (together with reasonably detailed calculations thereof), submitted to Borrower Agent by Agent or the affected Lender shall be final, conclusive and binding for all purposes, absent manifest error, and Borrowers shall pay such amounts to the appropriate party within 30 days following receipt of the certificate.