Cindy accompany her mother to the supermarket. There is an ongoing promotion.  (1) If customer spends $$$20$$ dollar and above, the person will get a $$$4$$ off.  (2) If customer spends $$$50$$ dollar and above, the person will get a $$$15$$ off.  Cindy\textquotesingle s mother bought some groceries and the total cost for the items are $$$62$$. How much should Cindy\textquotesingle s mother pay in the end? 
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