Your client asks you for a quote (both bid and ask) for the AUD-GBP cross exchange rate. You work for a small bank; thus, you will buy and sell the foreign exchange needed for this transaction from your counterparties, Citibank and Deutsche, who give you the following quotes:

Citibank Bid Ask USD per AUD 0.70 0.72

Deutsche Bid Ask USD per GBP 1.20 1.22 Whats the best bid-ask quote (AUD per GBP) you can offer your client, without losing any money on the transaction?