[問題] 全家黑松抽抽樂&買一送一
大家好
今天去全家時看到黑松的茶花麥茶買一送一,於是拿了兩瓶25元
結帳時店員要我再抽抽樂結果抽到49折,後來系統好像無視49折直接算兩瓶25元
請問正確的算法是25*0.49折還是因為優惠了所以不能重複計算呢?
另外如果不能重複計算,那店員幹嘛叫我抽==害我白高興了一下,想說手氣真棒呢…
再麻煩大家解惑,感激
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