To find the average rate of change, divide the difference on the number of employees over the difference in time.
The difference on the number of employees is:
[tex]150-120=30[/tex]
The difference on time (in years) is:
[tex]2020-2016=4[/tex]
Then, the average rate of change of the number of employees over time, is:
[tex]\frac{30}{4}=7.5\text{ employees per year}[/tex]
