Answer:
Percentage increase every year is 9%
Explanation:
If we have a function of the form
[tex]y=(1+a)^t[/tex]then a* 100% is the percent increase.
Now, the function
[tex]y=(1.09)^t[/tex]can be rewritten as
[tex]y=(1.00+0.09)^t[/tex]meaning a = 0.09; therefore, the percent increase is
[tex]0.09\cdot100\%[/tex][tex]=9\%^{}[/tex]which is our answer!