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A: I would like to buy this new laptop, please.
B: Would you like to buy the warranty?
A: What is a warranty?
B: It's something that fixes your machine should it break.
A: How does it work?
B: If your laptop breaks, just bring it in and we'll fix it.
A: How much is the laptop?
B: It costs $550 without tax.
A: How much is the warranty?
B: The warranty is $40 for two years.
A: I think I'll be fine with just the laptop.
B: Alright, but you can always change your mind.