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?