Upon the determination of a scale of charges for a market, the scale of charges shall be transmitted to the director. The director shall examine such scale and shall compare it with any available information relative to the charges for similar work which is performed under similar conditions in the city in, or for, which the market is operated. The director may take into consideration any and all factors which are relevant to the determination of the reasonableness of such charges, including any rates of the Public Utilities Commission for the performance of work of a similar nature.