The retail price of RON97 petrol will increase by two sen per litre while those for RON95 and diesel will remain unchanged for the Feb 24 to March 2 period.The Finance Ministry, in a statement today, said the retail price of RON97 will increase from RM3.27 to RM3.29 per litre while RON95 and diesel will remain at RM2.05 and RM2.15 per litre respectively.