Answer:
percent increase = 12.5%
Step-by-step explanation:
percent change = (new value - old value)/(old value) * 100%
percent change = (81 - 72)/(72) * 100%
percent change = 9/72 * 100%
percent change = 0.125 * 100% = 12.5%
Since the percent change is a positive number, it is a percent increase.
