Final answer:
Stan needs to make 20 sales to earn a total salary of $40,000.
Step-by-step explanation:
To find out how many sales Stan needs to make to earn a total salary of $40,000, we can set up an equation:
Total Salary = Base Salary + Additional Salary per Sale
40,000 = 32,000 + 400x
Where x is the number of sales Stan needs to make.
Now we can solve for x:
40,000 - 32,000 = 400x
8,000 = 400x
Subsequently, dividing both sides by 400:
x = 8,000 / 400
x = 20
Hence, Stan needs to accomplish 20 sales to attain a total salary amounting to $40,000, delineating the clear association between his sales performance and the target earnings.