(a) Every keeper of a hotel, inn, boardinghouse or lodginghouse, shall post in a conspicuous place in the office or public room, and in every bedroom of said hotel, boardinghouse, inn, or lodginghouse, a printed copy of this section, and a statement of rate or range of rates by the day for lodging.
(b) No charge or sum shall be collected or received for any greater sum than is specified in subdivision (a). For any violation of this subdivision, the offender shall forfeit to the injured party one hundred dollars ($100) or three times the amount of the sum charged in excess of what he is entitled to, whichever is greater. There shall be no forfeiture under this subdivision unless notice be given of the overcharge to such keeper within 30 days after payment of such charges and such keeper shall fail or refuse to make proper adjustment of such overcharge.