Richard is trying to decide whether or not to attend college during the next 12-week session. He has the following options:
1. Attend college full-time at a cost of $1,200.
2. Attend college part-time at a cost of $400 and work part-time earning $1,900.
3. Work full-time earning $4,700.
What is Richard's incremental profit if he chooses option 3 over option 2?