Final answer:
The Pinkman Company will pay a total of $5,132 in interest on the $20,000 loan over 4 years with an 8% interest rate.
Step-by-step explanation:
To calculate the total amount of interest that the Pinkman Company will pay on the $20,000 loan, we need to use the formula for compound interest. The formula is:

In this case, the Principal is $20,000, the Interest Rate is 8%, and the Time is 4 years.
Plugging in these values, we get:
Compound Interest =

Simplifying the equation, we calculate that the total amount of interest the company will pay is $5,132.