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Box 15 is not an appropriate box for foreign interest. You need to enter that amount in box 30 and have to report it in Canadian funds. Use the Bank of Canada exchange rate in effect on the day you received the income. If you received the income at different times during the year, use the average annual rate.
Please visit this Canada Revenue Agency link for more information: Line 12100 - Foreign interest and dividends
Find out more about Foreign Income and Tax Treaties in our TurboTax article.