20cents???

It was the last day i will be in kl and i was having dim sum with my family. When the bill comes,my mom was stuned by the results and started asking the dim sum fellow and the dim sum fellow told my mom that if u eat in another restaurant,the price will be double than the price here so my mom was not confident of the answer and asked the dimsum fellow how much each dish cost and was complaining about the price and the dimsum fellow got fed up and told her,"Aunty,these dim sum(s) are not expensive because we only increase the price of each dish by 20cents NIA!!!!" At that moment,my mom was silent but seconds after that she continues to complain and complain and we left that place unpeacefully.