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 pair of shoes for $11.00 after a 10% markup. What did the shop pay for it?
4. A shop sells a coat for $72.00 after a 20% markup. What did the shop pay for it?
5. A shop sells a backpack for $11.00 after a 10% markup. What did the shop pay for it?
6. A shop sells a bike helmet for $114.00 after a 20% markup. What did the shop pay for it?
7. A shop sells a coat for $110.00 after a 10% markup. What did the shop pay for it?
8. A shop sells a coat for $222.00 after a 50% markup. What did the shop pay for it?
9. A shop sells a game for $120.00 after a 20% markup. What did the shop pay for it?
10. A shop sells a coat for $217.00 after a 40% markup. What did the shop pay for it?
11. A shop sells a lamp for $30.00 after a 20% markup. What did the shop pay for it?
12. A shop sells a tablet case for $224.00 after a 40% markup. What did the shop pay for it?
13. A shop sells a jacket for $366.00 after a 50% markup. What did the shop pay for it?
14. A shop sells a lamp for $426.00 after a 50% markup. What did the shop pay for it?
15. A shop sells a coat for $300.00 after a 25% markup. What did the shop pay for it?
16. A shop sells a pair of shoes for $110.00 after a 25% markup. What did the shop pay for it?
17. A shop sells a pair of shoes for $105.00 after a 50% markup. What did the shop pay for it?
18. A shop sells a jacket for $627.00 after a 10% markup. What did the shop pay for it?
19. A shop sells a lamp for $605.00 after a 10% markup. What did the shop pay for it?
20. A shop sells a pair of shoes for $580.00 after a 25% markup. What did the shop pay for it?