Any person, persons, firm, association or corporation violating any provisions of the zoning ordinance of the City of Arnold, Missouri, or any employee, assistant, agent, or any other person participating or taking any part in, joining or aiding in a violation of any provision of the zoning ordinance may be prosecuted as provided by law for the violation of ordinances of the City of Arnold and upon conviction shall be punished by a fine not exceeding five hundred dollars ($500.00) for any one (1) offense or ninety (90) days imprisonment. Each day a violation continues after service of written notice to state such violation shall constitute a separate offense.