A Swiss bank converted 1.2 million Swiss francs to euros to make a euro loan to a customer when the exchange rate was 1.75 francs per euro. The borrower agreed to repay the principle plus 4% interest in 1 year. The borrower repaid euros at loan maturity and when the loan was repaid the exchange rate was 1.85 francs per EURO. What was the bank's franc rate of return?