Learning Task 2. Find the base.

1. 50 is 8% of what number?
2. 20% of what number is 15?
3. 12 is 4% of what number?
4. 80% of what number is 5?
5. 7 is 70% of what number?
6. 6 is 75% of what number?
7. 8 is 20% of what number?
8. 2.25 is 9% of what number?
9. 75% of what number is 12?
10. 49 is 87.5% of what number?