Ted's salary is defined as;
Salary = 5000 + 0.60x
Where x = sales above 8000.
Therefore, when his sales is > 8000, then
x = sales - 8000.
x = 12000 - 8000
x = 4000
Therefore;
[tex]\begin{gathered} \text{Salary which is s equals;} \\ s=5000+0.6x \\ s=5000+0.6(4000) \\ s=5000+2400 \\ s=7400 \end{gathered}[/tex]Ted's gross salary is $7,400