An investor in the United Kingdom purchases property in Australia. The initial investment is made in Australian dollars (AUD), and the exchange rate at the time of the investment is 1 GBP = 1.75 AUD. After five years, the investor sells the property. At that time, the exchange rate has changed to 1 GBP = 1.60 AUD. The investment originally cost the investor 350,000 GBP. How much did the exchange rate fluctuation impact the return on the investment in GBP?