Exchange rate is the rate at which one country's currency is changed for another country's currency. For example the rate at which one dollar can be changed for pound sterling or any other currency.
That depends on what you DO know. You might consider asking again, being more specific about what information you have. For example, if you know the amount of interest, the principal, and the length...
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The cost of borrowing money, expressed as a percentage, usually over a period of one year.
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CALL THE BANK THEY CAN HELP YOU UNDERSTAND THAT