(a) The commissioner shall adopt regulations necessary to carry out the purposes of sections 21a-73 to 21a-77, inclusive, for the best interests of consumers and, in addition, shall by regulation: (1) Designate those consumer commodities as to which display of the unit price shall be required, upon a determination that such display will be in the best interests of consumers; (2) designate the unit of weight, measure, or count in terms of which the unit price of each consumer commodity designated under subdivision (1) shall be expressed, provided that no designated unit shall be such as to require persons subject to the provisions of subsection (a) of § 21a-74 to measure any consumer commodity solely for the purpose of complying with said section; (3) designate whether the unit price of each consumer commodity designated under subdivision (1) shall be expressed to the nearest whole cent or fraction thereof; (4) prescribe the means for the disclosure of price information upon determination that such means would be more effective than those prescribed in subdivision (1) or (2) of subsection (b) of said § 21a-74.

(b) The commissioner shall adopt regulations pursuant to the provisions of chapter 54.

(c) The commissioner shall hold a hearing in accordance with the provisions of chapter 54 whenever he has probable cause to believe, or whenever twenty-five or more citizens state in writing to him their belief, that a person has violated any of the provisions of sections 21a-73 to 21a-76, inclusive.

(d) Upon a finding that a person has violated any of the provisions of sections 21a-73 to 21a-76, inclusive, the commissioner may issue a warning citation or may impose a civil penalty of not more than one hundred dollars for the first offense and not more than five hundred dollars for each subsequent offense. Each violation with respect to all units of a particular consumer commodity on any single day shall be deemed a single offense.