Answer:
Bundles              A      B      C      D
Concert Tickets        80     60     20      0
Books                0      50     150     200
Explanation:
Since each concert ticket costs $25,
- if Sam spends $2,000 on concert tickets, he will purchase 80 tickets
- if he spends $1,500 on concert tickets, he will purchase 60 tickets
- if he spends $500 on concert tickets, he will purchase 20 tickets
Since each concert ticket costs $10,
- if Sam spends $2,000 on books, he will purchase 200 books
- if he spends $1,500 on books, he will purchase 150 books
- if he spends $500 on books, he will purchase 50 books