When a commodity or service is sold, or is offered, exposed, or advertised for sale, by weight, measure, or count, the price may not be misrepresented, and the price may not be represented in a manner calculated or tending to mislead or deceive an actual or prospective purchaser. When an advertised, posted, or labeled price per unit of weight, measure, or count includes a fraction of a cent, all elements of the fraction shall be prominently displayed and the numeral expressing the fraction shall be immediately adjacent to, of the same general design and style as, and at least one-half the height and width of the numerals representing the whole cents.