This year you earned $75,500 Laat year you earned $72,400.
the rate of change on your earnings since last year
[tex]\begin{gathered} R=\frac{75500-72400}{72400}\times100 \\ R=\frac{3100}{72400}\times100 \\ R=4.28 \end{gathered}[/tex]So the rate of change is 4.28%.