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Making Change

Roland Piquepaille writes "There are mostly four kinds of coins in circulation in the U.S: 1 cent, 5 cents, 10 cents, and 25 cents. But is it the most efficient way to give back change? This Science News article says that a computer scientist has found an answer. "For the current four-denomination system, [Jeffrey Shallit of the University of Waterloo] found that, on average, a change-maker must return 4.70 coins with every transaction. He discovered two sets of four denominations that minimize the transaction cost. The combination of 1 cent, 5 cents, 18 cents, and 25 cents requires only 3.89 coins in change per transaction, as does the combination of 1 cent, 5 cents, 18 cents, and 29 cents." He also found that change could be done more efficiently in Canada with the introduction of an 83-cent coin and in Europe with the addition of a 1.33- or 1.37-Euro coin. Check this column for more details and references." The paper (postscript) is online.

4 of 935 comments (clear)

  1. Re:Yeah Right... by Anonymous Coward · · Score: -1, Troll

    Same thing when you post to Slashdot you fuck.

    DIE!

  2. Re:The quarter is hard enough by Anonymous Coward · · Score: -1, Troll


    You seem to know a lot about fast food resturants. I'll bet your a fat fucking slob, you greasy pig. Even if you're "naturally thin" and can eat whatever you want, your arteries are a clogged fatty mess and you'll be dead in a year or two. Typical Amerikan fuck knob.

  3. Re:Forget it. by Anonymous Coward · · Score: -1, Troll


    Hell, even your mom has a credit card reader mounted on the top of her head. That way your can conviently pay while she's sucking you off. The problem is that sometimes the card track fills up with a day's worth of jit, and she has to remove the unit and lick it clean.

  4. Gay by Anonymous Coward · · Score: -1, Troll

    This is Gay