The Rates of Exchange
You can use the following currency converter to learn the real-time rate of exchange.
Instructions: How to Withdraw Cash in Japan / Currency Exchanges in Japan
MEMO - examples
100 - 200 yen can buy a takeout snack in Nakamise Street in Asakusa, a pen, etc.
500 yen can buy an umbrella, McDonald's hamburger regular set, etc.
5000 - 10000 yen can buy one night stay at a single room in a hotel for business people, etc.