[分享] 7-11的79折活動小撇步
2010/07/28~08/24
7-11的79折活動..其實這個活動有一陣子了,但我想分享一個小撇步。
如果你只想買一罐15元的泰山水果茶,可以再順手拿一罐養樂多(8)塊錢,合計23元,這樣子打完79折後,是18元。
如果是20元的茶裏王,加上養樂多,折扣下來為22元
如果是25元的左岸咖啡,加上養樂多,折扣下來為26元
如果是30元的貝納頌,加上養樂多,折扣下來為30元
因此,結論為,15元的飲料,可以加3元獲得養樂多
30元以上的飲料,請拿一罐免費的養樂多..
30元以上的飲料,多拿一罐養樂多去結帳,你的飲料會比原價還低~~
以上,報告完畢
ps.如果你一次要買二罐的人,請忽略這則訊息。
http://www.7-11.com.tw/event/special/index.asp#G002
另外
要算出79折的臨界值,這個方程式的思考邏輯為:
假設X大於Y
(X+Y)*0.79 < X
0.79X+0.79Y < X
0.79Y < 0.21X
79Y < 21X
X >79/21Y
X > 3.76 Y
故此得知,只要你想買的飲料,貴的比便宜的大於3.76倍以上
請務必連便宜的也一起拿。
要轉貼的人,請附上我的原連結,謝謝
http://www.bigcome.com/2010/08/7-1179.html
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※ 編輯: benkl 來自: 114.45.252.91 (08/09 22:21)
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