11. To the left are the PPFs for countries Q and Z. In these countries people drink coffee and listen to MP3s, so all that is produced in these countries is coffee (10 lb. bags) and MP3 players. From the graph to the right you know that the best terms of trade Z could ever hope to negotiate with Q are:

2 bags of coffee for 1.5 MP3 players.
1 bag of coffee for 1.5 MP3 players.
0.5 bags of coffee for 1.5 MP3 players.
2 bags of coffee for 2 MP3 players.
1 bags of coffee for 2 MP3 players.