All license fees due in this chapter shall be payable in advance at the office of the city clerk and shall become due upon issuance of the license or, for any renewal, upon the anniversary date of the issuance. Delinquency upon any renewal shall occur at four p.m. on the fifteenth day following the anniversary date. To all delinquent licenses there shall be added a penalty of twenty percent of the amount of the fees due for the period. (Ord. 91-8, 1991; Ord. 89-12 (part), 1989)