[Pre-BB] MapleStory Formula Compilation

If someone is under leech range, they will always take a set amount of exp unless they do the most damage. Thus, if I hit a Squid for 1, or 49.99% of its HP on a 7x character, and some 10x kills it, I will still gain the same amount of exp from it regardless. At least, that's how I remember it from leeching off of DTs and Squids from my friend.

Then why do people get 20% of the exp when killing a misted monster (which should have 1 HP left)?
Hypothetically, they shouldn't even get 1 exp, if you're somewhere with high HP monsters such as Skeles. A misted skele... you kill 1 HP out of 84K hp, multiply that by 4500 exp and you get 0.05 exp per kill. Yet you'll get 20 for killing it.

However, if you hit a monster for 1 damage and then another person comes in and kills the monster (in other words, dealing the same amount of damage as from poison mist), he'll get 1 exp.

Thus, there must be an EXP curve that goes somewhat like this:
Monster HP bar (top = higher HP, bottom = 0 HP)
Assuming the damage you dealt is equal:
100% HP ~ 1 exp
75% HP ~ 5% exp
50% HP ~ 10% exp
25% HP ~ 15% exp
1 HP 20% exp

Someone investigate how this works?