Problem:
A U.S. bank converted $1 million to Swiss francs to make a Swiss franc loan to a valued corporate customer when the exchange rate was 1.2 francs per dollar. The borrower agreed to repay the principle plus 5% interest in 1 year. The borrower repaid Swiss francs at loan maturity and when the loan was repaid the exchange rate was 1.3 francs per dollar.
Required:
Question: What was the bank's dollar rate of return?
Note: Please explain comprehensively and give step by step solution.