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
A. $25,000
B. $296,429
C. $1960

To find the total sales, we can plug in the total annual salary ($45,000) into the equation and solve for x:

45,000 = 0.28x + 38,000
Subtract 38,000 from both sides:
7,000 = 0.28x
Divide by 0.28:
x = 25,000

Therefore, Adam's total sales for the year was $25,000.

So, the correct answer is:
A. $25,000