Unusual purchase
Logic
1
0
14.01.2010
Buyer: How much do you ask for one?
Seller: 20 roubles.
Buyer: How much for twelve?
Seller: That will go for 40 roubles.
Buyer: How about one hundred and twenty?
Seller: No problem, that would cost you 60 roubles.
What is the buyer asking for?
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