Euro-British Pound. How would the call option premium change on the right to buy pounds with euros if the euro interest rate changed to 4.1572% from the initial values listed in this table: The call option on British pounds, if the euro interest rate changed to 4.1572%, would be f If. (Round to four decimal places.) Therefore, the call option premium on British pounds at 4.1572% would by if. (Round to four decimal places and select the best answer from the drop-down menu.)