If any person shall neglect, fail or refuse to pay the amount assessed when it becomes due on any license mentioned or provided in this chapter, for a period of thirty (30) days after the date on which the license becomes due and payable, a penalty of twenty percent (20%) of the amount of the license shall be added to the original amount for each month or part thereof that the fee remains unpaid and the payment thereof enforced by the city. (Ord. 2008-09, 5-7-2008, eff. 6-11-2008)