Answer: The initial number of fungi in the culture is 2248.
Step-by-step explanation:
Since we have given that
Rate of growth for a certain type of fungi = 70% per hour
Number of hours = 6
Number of fungi = 54,273
So,we will apply the exponential function :

Here, A = 54,273
r = 70% = 0.7
t = 6
So, our equation becomes,

Hence, the initial number of fungi in the culture is 2248.