Answer:
Books Shirts
4 0
3 3
2 6
1 9
0 12
Explanation: At combination E, the economy is producing 0 books and 12 shirts. Since the opportunity cost of 1 book is 3 shirts, moving from point E to point D (gaining 1 book) requires this economy to produce 3 fewer shirts. Thus, the number of shirts in combination D must be 12 shirts−3 shirts=9 shirts. The rest of the combinations can be calculated in a similar fashion, with the answers summarized in the following table.
A 4 3−3=0
B 3 6−3=3
C 2 9−3=6
D 1 12−3=9
E 0 12