The cost isn't just the exchange rate.
Key points
Check the currency conversion rate at the time of settlement, any processing or international usage fees, and other charges announced by the bank, along with the applicable limits at the time of the transaction.
For a numerical example: If I buy something for $100, approximately how much will it cost in Egyptian pounds based on current rates and fees?
The figures, fees and limits in this answer vary by bank and change over time — confirm them with your bank or the official source before acting.