Decrease a number by a percent

Find the percent of the number, then subtract it.

1. A website had 92 visitors last week. This week it has 50% fewer. How many visitors does it have this week?
2. A tank holds 70 L of water. 10% of the water is used. How many litres are left?
3. A shop has 90 shirts. 50% of them are sold. How many shirts are left?
4. A shop has 60 shirts. 10% of them are sold. How many shirts are left?
5. A shop has 68 shirts. 25% of them are sold. How many shirts are left?
6. A tank holds 200 L of water. 25% of the water is used. How many litres are left?
7. A website had 170 visitors last week. This week it has 50% fewer. How many visitors does it have this week?
8. A shop has 165 shirts. 20% of them are sold. How many shirts are left?
9. A shop has 212 shirts. 50% of them are sold. How many shirts are left?
10. A tank holds 290 L of water. 10% of the water is used. How many litres are left?
11. A tank holds 185 L of water. 40% of the water is used. How many litres are left?
12. A shop has 305 shirts. 20% of them are sold. How many shirts are left?
13. A shop has 20 shirts. 15% of them are sold. How many shirts are left?
14. A tank holds 410 L of water. 90% of the water is used. How many litres are left?
15. A tank holds 700 L of water. 50% of the water is used. How many litres are left?
16. A shop has 740 shirts. 5% of them are sold. How many shirts are left?
17. A website had 2000 visitors last week. This week it has 70% fewer. How many visitors does it have this week?
18. A tank holds 880 L of water. 45% of the water is used. How many litres are left?
19. A shop has 1320 shirts. 45% of them are sold. How many shirts are left?
20. A shop has 430 shirts. 60% of them are sold. How many shirts are left?