Final answer:
The cross-rate between the euro and yen is 200 yen/euro.
Step-by-step explanation:
The cross-rate between the euro and yen can be calculated by comparing their exchange rates with the US dollar.
If $1.00 can buy 0.6 euro and 120 yen, we can find the cross-rate by dividing the exchange rate between the yen and the dollar by the exchange rate between the euro and the dollar.
So, the cross-rate between euro and yen is: (120 yen/dollar) / (0.6 euro/dollar) = 200 yen/euro
This means that 1 euro is equivalent to 200 yen.