Adam calculates his annual salary (base pay and commission), y, using the model y = 0.28x+38,000, where x represents his total sales for the year.
If Adam made $45,000 total annual salary, how much was his total sales?
Let's plug in the given total annual salary into the formula and solve for x:
$45,000 = 0.28x + $38,000
Subtract $38,000 from both sides:
$7,000 = 0.28x
Now, divide both sides by 0.28:
x = $7,000 / 0.28
x = $25,000
Therefore, Adam's total sales for the year was $25,000.