Find the original price from the sale price

The sale price is a percent of the original. Find 1%, then 100%.

1. A pair of shoes is 20% off. The sale price is £52. What was the original price?
2. A backpack is 10% off. The sale price is £27. What was the original price?
3. A game is 20% off. The sale price is £104. What was the original price?
4. A backpack is 10% off. The sale price is £153. What was the original price?
5. A lamp is 10% off. The sale price is £216. What was the original price?
6. A jacket is 25% off. The sale price is £66. What was the original price?
7. A jacket is 20% off. The sale price is £84. What was the original price?
8. A game is 20% off. The sale price is £64. What was the original price?
9. A game is 20% off. The sale price is £288. What was the original price?
10. A bike helmet is 40% off. The sale price is £27. What was the original price?
11. A tablet case is 20% off. The sale price is £88. What was the original price?
12. A backpack is 50% off. The sale price is £185. What was the original price?
13. A pair of shoes is 10% off. The sale price is £441. What was the original price?
14. A bike helmet is 50% off. The sale price is £352. What was the original price?
15. A tablet case is 60% off. The sale price is £108. What was the original price?
16. A coat is 10% off. The sale price is £234. What was the original price?
17. A backpack is 25% off. The sale price is £609. What was the original price?
18. A jacket is 20% off. The sale price is £460. What was the original price?
19. A bike helmet is 15% off. The sale price is £119. What was the original price?
20. A bike helmet is 50% off. The sale price is £341. What was the original price?