On Basketball Reference they state that
Assist Percentage; the formula is 100 * AST / (((MP / (Team MP / 5)) * Team FG) - FG). Assist percentage is an estimate of the percentage of teammate field goals a player assisted while he was on the floor.
If you take a game from the NBA and look at Russell Westbrook for example.
So using the formula I do
100 * 10 / (((36 / (48 / 5)) * 40) - 17)
Which equals 7.519
But on the NBA stats site it comes back with 58.8.
Have I done something wrong with the calculation here or am I missing something?