Unfair and misleading prices, price tag and till price differ.

I went to this Mini Fresh Butchery today to buy packet of Advicados .Priced at R24.99. When I I reached the till the price rang was R25. I then asked how come is not the price on the tag of product. The cashier referred me to her supervisor who ridiculed me because I was being petty.Prices are rounded off.My question is, is this price not misleading.Am I petty to question why the extra cent is added? Will the shop accept my payment if it were one cent shot. I believe this is an ********* business practice.Price on product purchased must be the same price at the till. I was disappointed to learn that the shop supervisor saw nothing wrong with this practice.I cry foul play for every cent being ********** from clients through this price manipulation.