The number of cars he must sell in order to earn at least 40,000 is 35 cars.
Fixed pay is the pay that is earned that is not dependent on the number of cars sold. Variable pay is the pay that is determined by the number of cars sold.
This equation can be used to represent the total pay :
40,000 = 24,000 + 0.015(30,500x c)
Where c represents the total number of cars
40,000 = 24,000 + 457.50c
In order to determine the value of c, take the following steps:
Combine similar terms
40,000 - 24,000 = 457.50c
16,000 = 45,750c
Divide both sides by 45,750
c = 35 cars
To learn more about division, please check: https://brainly.com/question/13281206