Exp gained by 1 person in party = (A)*[1+0.2*(B-1)]/B
A = Exp gained by lowest lvler in party if he kills the creep alone(SOLO)
B = Number of players in party
I can't recollect algorithm for how much exp player gets depending on player lvl n monster lvl.(i'll post when i can locate it)
1 more thing is Overhit exp. the amount of damage u do to a creep which is above its HP is given as bonus exp
lets say cynik gives 2000 Exp
Mage hits 2 stigmas (each 800,assumption)
800+800= 1600 (HP of cynik is 1000)
exp gained wil be 2000 *(1600/1000) = 3200
This overhit exp bonus is noticable with all Low hp monsters on which high attack skills are used as last shot(e.g SB, UW, Aposple,etc,. especially when they crit)
Monsters which can be exploited for this are Cyniks(best), Lalons, Tanhuants, S1 creeps(by SB mage), Olgocs(when leeching noobs)