Answer :
The amount of Mario's student loan debt forgiven that must be included in gross income is $10,000.
Mario's student loan debt
Using this formula
Student loan debt= Current year student loan discharge-Assets
Where:
Current year student loan discharge=$18,000
Assets=$8,000
Let plug in the formula
Student loan debt=$18,000-$8,000
Student loan debt=$10,000
Inconclusion the amount of Mario's student loan debt forgiven that must be included in gross income is $10,000.
Learn more about student loan debt here:https://brainly.com/question/26492094