書籍優惠規則
- 一到五集的哈利波特，每一本都是賣100元
- 如果從這個系列買了兩本不同的書，則會有5%的折扣
- 如果買了三本不同的書，則會有10%的折扣
- 如果是四本不同的書，則會有20%的折扣
- 如果一次買了整套一到五集，將有25%的折扣
- 需要留意的是，如果買了四本書，其中三本不同，第四本則是重複的， 那麼那三本將享有10%的折扣，但重複的那一本，則仍須100元。
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