If a population of bacteria doubles every 20 minutes, starting from 100 cells, how many cells will there be after 1 hour?
✓ Correct Answer: Option C
1 hour = 3 doublings (0→20→40→60 min). 100 → 200 → 400 → 800.
1 hour = 3 doublings (0→20→40→60 min). 100 → 200 → 400 → 800.