I have a different idea of how it works. I believe that points per 100 shots is calculated by multiplying a player's shooting percentage for the game by 200 (100 to make it a whole number and 2 because you get 2 points per bucket.) I don't think it takes into account either free throws or 3 pointers.
In this case the player went 14-20, which is .700, meaning his points per 100 shots for the game was 140. What the difference means is that your guy had a great day from the field.
That's the way I've been figgerin' since season 3, and it seems to be fairly reliable, with a +/- for FT's and 3's.
Once I scored a basket that still makes me laugh.