Custom Drops chances from certainly named mobs

[BlockBoyZ]

I want a mob with a certain name to drop a certain item, but only with a chance. I was able to do the specific name thing, but not the chance. This is what i got. I couldn't get the chance thing no matter what i tried.

on death:
  if display name of victim is "Jeff":
  clear the drops
  set {_drop} to emerald named "Money"
  drop {_drop} at victim's location

 

[SoulNitro]

on death:

  if name of victim is "jeff":

    chance of 80%:

      clear the drops

      drop emerald named "&aMoney" at victims location

btw didnt test this