Final answer:
Residual income is calculated by subtracting the desired return on investment (ROI) from the operating income. In this case, the residual income is $5,000.
Step-by-step explanation:
Residual income is calculated by subtracting the desired return on investment (ROI) from the operating income.
The formula for residual income is:
Residual Income = Operating Income - (Operating Assets x Desired ROI)
Using the given information, we can calculate the residual income:
Residual Income = $20,000 - ($100,000 x 0.15) = $20,000 - $15,000 = $5,000