Answer:
Percentage increase every year is 9%
Step-by-step explanation:
If we have a function of the form
![y=(1+a)^t](https://img.qammunity.org/2023/formulas/mathematics/high-school/2hvw5icr21p8zsrmr7n8iuiioe1jplppj9.png)
then a* 100% is the percent increase.
Now, the function
![y=(1.09)^t](https://img.qammunity.org/2023/formulas/mathematics/high-school/8k8frbuh0174p6wgrixfzu0nloxy204kah.png)
can be rewritten as
![y=(1.00+0.09)^t](https://img.qammunity.org/2023/formulas/mathematics/high-school/l869l6jrgt5mk6tdvl0nx02bm8ane28ejx.png)
meaning a = 0.09; therefore, the percent increase is
![0.09\cdot100\%](https://img.qammunity.org/2023/formulas/mathematics/high-school/929na27wsise2lueztpatt5yskexoo644j.png)
![=9\%^{}](https://img.qammunity.org/2023/formulas/mathematics/high-school/cvaj7479t44l6c1m9who8qoj38xafpwy6w.png)
which is our answer!