What was I buying and how much did it cost me?

At the hardware store
I was quoted 12 cents for one,
24 cents for 50, and
36 cents for 144.
I wanted six.
What was I buying and
 how much did it cost me?

Click here for Answer

Prices quoted were for house numbers at 12 cents per number.
A number'6' cost me 12 cents.