Exchange rates in Japan

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Exchange rates are always changing so you can travel cheaply when Japanese yen is cheaper than other currencies.
For example, 1 dollar is 100 yen on average, but it could be sometimes 120 yen.
When the price of dollar is high compared to yen, you will get a better off and vice versa.

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If you want to exchange money at an airport, you should go to a booth for foreigners and ask staff what store provides a good deal at the airport because some stores set their transaction price really high.