Asking the price of something bought:
How much did you buy it for?
For how much did you buy it? (grammatically ok, less common)
How much did you pay for it?
How much did it cost?
What did it cost?
2019년 10월 4일
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Buy/ bought refers to the item.
Pay/paid refers to money.
I bought a sandwich. I paid $4.99 plus tax.
2019년 10월 4일
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The first would have to be "How much did you buy?"
It does not mean the same thing. It means "How many items did you buy?"
Buy and pay have slightly different meanings.
2019년 10월 4일
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How much did you buy it? doesn't make sense unless you mean how much of it you did you buy? the other one makes sense