Susan is trying to decide whether or not to attend college during the next 12-week session. She has the following options:

1. Attend College full-time at a cost of $1200.
2. Attend college part-time at a cost of $400 and work part-time earning $2000.
3. Work full-time earning $4600

What is Susan's incremental profit if she chooses option 3 over option 2?