The European Exchange Rate Mechanism (ERM) is based on the concept of fixed currency exchange rate margins, but with exchange rates variable within those margins. This is also known as a semi-pegged system. Before the introduction of the euro, exchange rates were based on the European Currency Unit (ECU), the European unit of account, whose value was determined as a weighted average of the participating currencies. Suppose the central rates within the ERM for the French franc and DM are FF 6.90403/ECU 1 and DM 2.05853/ECU 1, respectively. What is the cross-exchange rate between the franc and the mark?