All charges billed on the statement shall be due and payable on the due date provided on the statement. The due date shall be between fifteen (15) and twenty five (25) days after the statement is mailed. All payments received by the city shall be allocated among the charges on the statement according to procedures determined by the city recorder. These procedures shall be based on requirements of the city's debt obligations and limitations which may be inherent in the city's computer facilities. (Ord. 1989-2 § 1: prior code § 14-412)