The solution to the problem is as follows:
Given:
Rate = 2.7% per hour
t = 21 hours
Formula:
y = b(1+r)^t
Solution:
= 800((3.7)^21)
6.8442552e+14
The amount of bacteria present after 21 hrs would be 6.8442552e+14.
I hope my answer has come to your help. God bless and have a nice day ahead!