Answer:
Option D. 300%
Step-by-step explanation:
Let the number of bacteria in Dr Nall's petri dish = x
After one hour number of bacteria in the petri dish = 3x
So the percentage of the population compared to the population the hour before will be
= \(\frac{\text{Population after 1 hour}}{\text{Population before 1 hour}}\times 100\)
= \(\frac{3x}{x}\times 100\)
= 300%
Therefore, Option D. will be the answer.
