An American company decides to invest in a technology startup in the eurozone. The investment is made in euros (EUR), and the exchange rate at the time of the investment is 1 USD = 0.90 EUR. Two years later, the company sold its stake in the startup. At that time, the exchange rate had changed to 1 USD = 0.85 EUR. The initial investment was 500,000 USD. How much did the exchange rate fluctuation impact the return on the investment in USD?