Answer:
25% increase
Step-by-step explanation:
This problem has 3 important variables. The variable x is the amount of years which is the power of 1.25, which is the number that gives us whether or not the relation is increasing or decreasing. 72 is just simply the number we started off with and are seeing how the rate changes the price.
The base, 1.25, is above 1 which means it is an increase of percentage by 25 percent. We would subtract 1.25-1 to get .25 which is 25 percent.
If the base was anything lower then 1, it would be that number subtracted by 1 and converted into percentage like I did above.