Make change from $50 and $100 notes

Now with a $50 or a $100 note.

1. Something costs $13. You pay with a $50 note. How much change do you get?
2. Something costs $7. You pay with a $100 note. How much change do you get?
3. Something costs $31. You pay with a $50 note. How much change do you get?
4. Something costs $88. You pay with a $100 note. How much change do you get?
5. Something costs $72. You pay with a $100 note. How much change do you get?
6. Something costs $84. You pay with a $100 note. How much change do you get?
7. Something costs $80. You pay with a $100 note. How much change do you get?
8. Something costs $7. You pay with a $50 note. How much change do you get?
9. Something costs $45. You pay with a $100 note. How much change do you get?
10. Something costs $24. You pay with a $50 note. How much change do you get?
11. Something costs $15. You pay with a $50 note. How much change do you get?
12. Something costs $52. You pay with a $100 note. How much change do you get?
13. Something costs $22. You pay with a $50 note. How much change do you get?
14. Something costs $66. You pay with a $100 note. How much change do you get?
15. Something costs $6. You pay with a $50 note. How much change do you get?
16. Something costs $27. You pay with a $50 note. How much change do you get?
17. Something costs $11. You pay with a $100 note. How much change do you get?
18. Something costs $79. You pay with a $100 note. How much change do you get?
19. Something costs $18. You pay with a $50 note. How much change do you get?
20. Something costs $25. You pay with a $50 note. How much change do you get?