外国為替(Foreign eXchange)
USD/JPY 20 -> 15 EUR/USD, EUR/JPY, GBP/JPY, AUD/JPY 30 -> 20 GBP/USD, AUD/USD 50
EUR/USD 0.3 USD/JPY 0.3
EUR/USD 1.5 USD/JPY 1.3 GBP/USD 2.3
USD/JPY 3.0 -> 1.0
EUR/USD 3.0 USD/JPY 2.0
EUR/USD 0.4 USD/JPY 0.3 GBP/USD 1.0