In 9 to 4 odds, it means that every time you bet $4, you get $9 back, which of course is a +$5 difference. You gave up $ in order to make the deal, so, aren't you technically only making a profit of $1, not 13, or 5?
Most Helpful Guy
You get your stake back plus difference.
4 dollar stake at 9/4 - Return is 13 dollars0