A price goes up and then down by percents

Do the first change, then take the second percent of the new amount.

1. The price of a tablet case is £400. It goes up by 10%, and then the new price goes down by 20%. What is the final price?
2. The price of a bike helmet is £700. It goes up by 20%, and then the new price goes down by 20%. What is the final price?
3. The price of a jacket is £500. It goes up by 10%, and then the new price goes down by 20%. What is the final price?
4. The price of a tablet case is £900. It goes up by 50%, and then the new price goes down by 20%. What is the final price?
5. The price of a bike helmet is £800. It goes up by 50%, and then the new price goes down by 10%. What is the final price?
6. The price of a tablet case is £1100. It goes up by 50%, and then the new price goes down by 20%. What is the final price?
7. The price of a lamp is £1600. It goes up by 25%, and then the new price goes down by 25%. What is the final price?
8. The price of a coat is £1400. It goes up by 20%, and then the new price goes down by 10%. What is the final price?
9. The price of a pair of shoes is £400. It goes up by 40%, and then the new price goes down by 20%. What is the final price?
10. The price of a backpack is £1800. It goes up by 25%, and then the new price goes down by 50%. What is the final price?
11. The price of a jacket is £1700. It goes up by 25%, and then the new price goes down by 20%. What is the final price?
12. The price of a lamp is £1300. It goes up by 50%, and then the new price goes down by 10%. What is the final price?
13. The price of a game is £1000. It goes up by 10%, and then the new price goes down by 20%. What is the final price?
14. The price of a bike helmet is £1000. It goes up by 10%, and then the new price goes down by 30%. What is the final price?
15. The price of a bike helmet is £1600. It goes up by 50%, and then the new price goes down by 50%. What is the final price?
16. The price of a tablet case is £1600. It goes up by 25%, and then the new price goes down by 40%. What is the final price?
17. The price of a tablet case is £1400. It goes up by 50%, and then the new price goes down by 50%. What is the final price?
18. The price of a coat is £2000. It goes up by 40%, and then the new price goes down by 5%. What is the final price?
19. The price of a game is £1700. It goes up by 50%, and then the new price goes down by 40%. What is the final price?
20. The price of a pair of shoes is £800. It goes up by 10%, and then the new price goes down by 10%. What is the final price?