All assessments shall be computed on those businesses in existence as of July 15 of each calendar year. All assessments will be due and payable in advance on November 1 of each year for the period commencing November 1 of each year and ending September 30 of the succeed-ing year, and will become delinquent if not paid by November 1 following the due date. Delin-quent payment shall be subject to the same penalties for late payment as provided in Sec-tion 19-21 of this code with respect to annual business licenses. (Ord. No. 2437 (N.C.S), § 2.)