Given:
The exponential function is:

To find:
The percentage of increase or decrease.
Solution:
The general exponential function is:
...(i)
Where, a is the initial value,t is the time period, r is the rate of increase if
and r is the rate of decrease if
.
We have,

It can be written as:
...(ii)
On comparing (i) and (ii), we get

Since
, therefore the given function is an increasing function.


Therefore, the percentage of increase is 47.1%.