Any person violating the provisions of Sections 50-13-210, 50-13-220, 50-13-250, or 50-13-280 must upon conviction for a first offense of any of the sections be fined not less than thirty dollars nor more than two hundred dollars or imprisoned for not more than thirty days and for a subsequent offense of any of the sections be fined not less than three hundred dollars nor more than five hundred dollars or imprisoned for not more than sixty days, or both. Subsequent offense is an offense against any of the sections and not any one in particular. But only those offenses of any of the sections which occurred within a period of two years, including and immediately preceding the date of the last offense shall constitute prior offenses within the meaning of this section.