Answer:
Egypt.
Explanation:
We need to set up our conversion factors for each currency.
British Pounds and Egyptian Pounds:
0.83 £ (Europe) = 1 U.S. Dollar
18 E£ (Egypt) = 1 U.S. Dollar
Cost of a Souvenir in Europe:
The cost of souvenir in Europe is 13£. Using our conversion rate, we get

Cost of a Souvenir in Egypt:
The cost of a souvenir in Egypt is 342 E£. So we have

Based on our calculations, it is cheaper to buy a souvenir in Europe than in Egypt.