The currency in Japan is Yen.  One hundred yen is equal to about one dollar.   There are no bills in yen until you get to 10000Y which is equal to about the ten dollar bill.  The yen up to 10000Y are coins.  It's  fun to walk around with two different types of currency in your wallet.  It's pretty funny when you try to give your American dollar to someone in Japan.  They are too polite to say anything, but just wait for you to realize your mistake.  In Japan, we would wait until the yen rate was good to purchase yen.  That would mean I would get more yen for my dollar.  When I lived in Japan, the yen rate was about 133Y to one dollar. 

On the military base that I lived on, the stores, took only American dollars, but no pennies.  If your purchase was nearer to the 5 in your amount you paid extra, if if was closer to the zero, you paid less.   I guess they figured it balanced out.  Pennies were to expensive to ship to the United States.

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