Based on the additional income that the student will get at graduation and the cost of the courses, the incremental income here is $8,500.
The is the additional income that we gain from pursuing a course of action, less the costs of that action.
In this case, the incremental income will be:
= Additional income - additional cost
= 10,000 - 1,500
= $8,500
In conclusion, the incremental income is $8,500.
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