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There are 12 possible answers:
1. 2 × 50 = 100
2. 4 × 25 = 100
3. 4 × 50 = 200
4. 4 × 75 = 300
5. 5 × 20 = 100
6. 5 × 40 = 200
7. 5 × 60 = 300
8. 5 × 80 = 400
9. 6 × 50 = 300
10. 8 × 25 = 200
11. 8 × 50 = 400
12. 8 × 75 = 600
Edwin