What did the man buy for his newly painted house?

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$3 for 600

A man goes to a hardware shop and asks for the price of an item.
The shop keeper replies that the item is "one for $1".
The man gives the shop keeper "$3 for 600".
What did the man buy for his newly painted house?

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Answer :
He bought the 3 numbers, "6","0" and "0".