Answer:
7 barrels of oil per pound of cheese
Step-by-step explanation:
Sweden has a comparative advantage in producing oil while Portugal has a competitive advantage in producing cheese.
In order for the trade to be beneficial to Sweden, it must give up less than 10 barrels of oil for a pound of cheese.
In order for the trade to be beneficial to Portugal, it must accept more than 5 barrels of oil for a pound of cheese.
Therefore, the number of pounds of cheese that would allow both countries to gain is:
The only answer option that fits within the interval is 7 barrels of oil per pound of cheese.