Chennai, Mar 10 (PTI) Prices of all commodities remained unchanged on the opening day in the wholesale foodgrain market here today. Following are the wholesale rates of various agri-commodities (rates in rupees per quintal, unless stated otherwise):Thoor Dal Rs 8,400, Urad Dal Rs 7,500, Moong Dal Rs 8,000, Gram Dal Rs 5,300, Sugar Rs 3,450, Wheat Rs 3,200, Maida (90 kg) Rs 3,200 and Sooji (90 kg) Rs 3,300.