Given:
Initial population = 45,000
Decreasing rate = 2%
Time = 5 year
To find:
The population after a period of 5 years.
Solution:
Formula used:

where, a is initial population, r is rate and t is time.

Decreasing rate represented by -0.02.
Substitute a=45000, r=-0.02 and t=5 in the above formula.




Approximate the value to the previous integer.

Therefore, the population after 5 years is 40717.