Using an exponential function, it is found that the expression that can be used to calculate the total percent increase in their annual salary from the first year to the last year is given by:
[tex]P = 100\% \times [(1 .03)^t - 1][/tex]
An increasing exponential function is modeled by:
[tex]A(t) = A(0)(1 + r)^t[/tex]
In which:
As a percentage, the increase is modeled by:
[tex]P = 100\% \times [(1 + r)^t - 1][/tex]
In this problem, the growth rate is of r = 0.03, hence:
[tex]P = 100\% \times [(1 + 0.03)^t - 1][/tex]
[tex]P = 100\% \times [(1 .03)^t - 1][/tex]
More can be learned about exponential functions at https://brainly.com/question/25537936