Any person, firm or corporation violating any of the provisions of this chapter shall be deemed guilty of an offense, and upon conviction, shall be punished by a fine of not less than fifty dollars nor more than two thousand dollars or by imprisonment in the city jail for a term of not less than two days nor more than fifty days, or by both such fine and imprisonment, within the discretion of the court. Each day such violation is committed or permitted to continue constitutes a separate offense and shall be punishable as such under this section.