It is 6000.
6500
1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 11000, . . .
This means the nearest multiple of 1000. Multiples of 100 are 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000... etc. To round to the nearest thousand, you identify which of these values is closest to 7533. 7533 is in between 7000 and 8000, but closer to 8000, so your answer would be 8000.
4567
3:4
It is 6000.
6000
33.3% increase.
$6000-$8000
6000 to 14000 = 3 to 7
roughly 6000-8000
6500
Easy: 4000 Normal: 4000 Advanced: 6000 Expert: 8000 Versus: 6000
6000-8000 ohms
6000 to 8000 square feet
6000+7000+8000+400+10+3