An American firm wants to borrow 100 million USD for 1 year to fund a capital investment project. The firm can borrow the money from a U.S. bank at an interest rate of 6%. Alternatively, the firm could borrow British pounds at a rate of 3% a year. At the end of the year, the firm would pay back the loan and interest. The initial exchange rate is 1 GBP = 2 USD. If at the end of the year the exchange rate changes from 1 GBP = 2 USD to 1 GBP = 3 USD, what was the actual cost of borrowing (effective interest rate) if the American firm chose to obtain the loan in British pounds