Mashaal Masha
Bacteria are growing in a liquid growth medium. There were 300,000 cells per milliliter during an initial observation. The number of cells per milliliter doubles every 3 hours. How many cells per milliliter will there be 15 hours after the initial observation?
Difficulty: Medium
A: 

1,500,000

B: 

2,400,000

C: 

4,500,000

D: 

9,600,000

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