Interest rates between the United States of Albion (U.S.A.) and the Republic of Oz are currently the

Question:

Interest rates between the United States of Albion (U.S.A.) and the Republic of Oz are currently the same. However, you now think there is a 50% chance that the Oz dollar will depreciate by 30% over the next week. What has to happen to interest rates in Oz to keep a ﬁxed with the U.S.A.?
Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...