Identify what part is unknown in the following percent problems. write "B" if it is the base "P" if its the percentage Or "R" if its the rate.

Answer:
1. R
2. R
3. B
4. B
5. B
6. R
7. P
8. P
9. B
10. R
11. C
12. C
13. C
14. D
15. D
16. D
17. A
18. B
19. C
20. B