The population of bacteria after 40 hours is 254
Step-by-step explanation:
Initial population of bacteria = 40
Growth rate: Doubles every 15 hours
The population function is given as:

Here
P0 is the initial population
r is the growth rate
and t is the time in hours
The growth rate will be: 
Putting the values in the function

Rounding off to nearest whole number we get
P_t ≅254
Keywords: Population growth,, bacteria
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