In the EMS before September 1992, the Italian lira/DM exchange rate could fluctuate by up to 2.25

Question:

In the EMS before September 1992, the Italian lira/DM exchange rate could fluctuate by up to 2.25 percent up or down. Assume that the lira/DM central parity and band were set in this way and could not be changed. What would have been the maximum possible difference between the interest rates on one-year lira and DM deposits? What would have been the maximum possible difference between the interest rates on six-month lira and DM deposits? On three-month deposits? Do the answers surprise you? Give an intuitive explanation.

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...