Yes, but it would be very unusual. I wonder if there is another question behind this question. Anybody who feels the need to eat like that knows they are very far from the norm and probably has some idea why. I would definitely see a doctor just to make sure every thing is OK. There may not be a medical problem but for anything this extreme you should see a doctor - it's just common sense.
5000-8000 Split into 5-7 meals, that comes out close to 1000 calories per meal.
Jogging at 10 km/h would burn around 400 calories. Therefore, to burn 8000 calories you would need to jog for about 20 hours. 8000 calories as you may know corresponds closely to 1 kg of body fat (7700 calories).
8000
yes
Depends on how hard they're working, but 5000-8000 wouldn't be unreasonable.
8000
Bad news: 8000
8000
This would be 8000 because you would round down.
8000
2% of 8000 = 2% * 8000 = 0.02 * 8000 = 160
13% of 8000= 13% * 8000= 0.13 * 8000= 1,040