A tourist from the UK travels to Australia and exchanges £800 into Australian Dollars (AUD) at an exchange rate of 1.85 AUD to 1 pound. During their trip, they spend 580 AUD. Upon returning to the UK, they exchange their remaining AUD back into pounds at a new exchange rate of 1.60 AUD to 1 pound. How many pounds are they left with?
£437.50
£486.49
£562.50
£1440.00