When traveling, don't automatically choose to pay in Egyptian pounds just because the amount is obvious.
Key points
If the merchant offers DCC (Digital Conversion Code), check the conversion rate and fees and compare them to what your card would charge if you paid in the local currency.
In many cases, paying in the local currency avoids the DCC margin, but the final decision depends on your card's pricing at the time.
Always ask to see the currency and rate before confirming.
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.