This is for my personal finance class. For the following question the answer I got was 804 and that answer is wrong. Do you know what I am doing

This is for my personal finance class. For the following question the answer I got was 804 and that answer is wrong. Do you know what I am doing wrong? Assuming Bob did use margin, paid a $60 total commission to buy his Verizon stock and another $60 to sell his stock, and sold the stock for $52 a share, how much profit did he make on his Verizon stock investment?