50 POINTS
Country Q can produce 15 pairs of socks and 5 belts in one hour. Country Z can produce 20 pairs of socks and 20 belts in one hour. Which of the following terms of trade would be mutually beneficial to both countries?
1 belt for 2 pairs of socks
1 pair of socks for 2 belts
2 belts for 2 pairs of socks
1 belt for 5 pairs of socks
5 pairs of socks for 15 belts