Answer:
$15,480
Explanation:
Let's make this problem into an equation.
$3750 each month is the constant because we are only looking at his earnings for 1 month. Meaning that this number will not change.
8.5% or 0.085 is the coefficient of the variable as this is applied to the total amount of car sales.
M (monthly total) = 0.085 * s (car sales) + $3750
M = 0.085 ($138,000) + $3750