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¨ç $20 ¨è $40 ¨é $42 ¨ê $50 ¨ë $82
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M: The food was great!
W: I agree. Should we add up the bill?
M: OK. We ordered one large potato pizza, 2 seafood spaghetti, and one pitcher of coke. The total adds up to $50.
W: But wait! I have a coupon, and we can get a 20% discount.
M: Oh! I just remembered I have a membership card and a pitcher of coke is free. Can we use both at the same time?
W: Unfortunately, no. The coupon says it can't be used with the membership card. We can only use one at a time.
M: If we want a free coke, we have to pay $42. But if we use your coupon, we only pay $40. So, I think we should use your coupon.
W: Wait, I just remembered I'm having my son's birthday party here next weekend. Can I save my coupon for that day?
M: Oh, alright. Let's just use my membership card this time.
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