Find the cost before a markup

The total is more than 100% of the starting amount. Divide the total by that percent, then multiply by 100.

1. A shop sells a tablet case for £57.00 after a 50% markup. What did the shop pay for it?
2. A shop sells a lamp for £77.00 after a 10% markup. What did the shop pay for it?
3. A shop sells a lamp for £77.00 after a 10% markup. What did the shop pay for it?
4. A shop sells a pair of shoes for £11.00 after a 10% markup. What did the shop pay for it?
5. A shop sells a coat for £102.00 after a 20% markup. What did the shop pay for it?
6. A shop sells a backpack for £11.00 after a 10% markup. What did the shop pay for it?
7. A shop sells a bike helmet for £114.00 after a 20% markup. What did the shop pay for it?
8. A shop sells a coat for £110.00 after a 10% markup. What did the shop pay for it?
9. A shop sells a coat for £369.00 after a 50% markup. What did the shop pay for it?
10. A shop sells a game for £120.00 after a 20% markup. What did the shop pay for it?
11. A shop sells a coat for £217.00 after a 40% markup. What did the shop pay for it?
12. A shop sells a lamp for £30.00 after a 20% markup. What did the shop pay for it?
13. A shop sells a tablet case for £350.00 after a 40% markup. What did the shop pay for it?
14. A shop sells a jacket for £366.00 after a 50% markup. What did the shop pay for it?
15. A shop sells a lamp for £426.00 after a 50% markup. What did the shop pay for it?
16. A shop sells a coat for £300.00 after a 25% markup. What did the shop pay for it?
17. A shop sells a pair of shoes for £156.00 after a 20% markup. What did the shop pay for it?
18. A shop sells a pair of shoes for £105.00 after a 50% markup. What did the shop pay for it?
19. A shop sells a jacket for £627.00 after a 10% markup. What did the shop pay for it?
20. A shop sells a lamp for £605.00 after a 10% markup. What did the shop pay for it?