Chance of negative status?

[bleu]

I heard of the 97+3 Stun immunity formulae... but I wanna know how to calculate the success chance of inflicting the negative status?

Very tired of talking about Stun. So, I will pick another, say Sleep.

Attacker= lvl 85/50 Hunter
INT30 (Total)
Sandman Trap lvl5 90% chance to cause sleep

Target= lvl 99/50 Bard
INT40 (Total)
VIT= 80 (Base)
Gemini-S58 Card [Base Vitality >= 80]
Add a 30% resistance against Stone Curse and Sleep.

What is the actual chance of the Bard sleeping?

How about Curse?

Attacker= lvl 85/50 Hunter
INT30 (Total)
LUK60 (Total)
Using a Quad Cursing Bow ( 4 Magnolia cards - Curse an enemy when you attack (Success Chance 5%).
ATK + 5)
And also using a Cursed Arrow
http://ratemyserver.net/index.php?iname=cursed+arrow&page=item_db&isearch=Search&itype=-1

Target= lvl 99/50 Bard
INT40 (Total)
VIT= 80 (Base)
LUK = 20 (Total)
Wearing a Drooping Cat
A cute kitty doll which can be worn on top of the head.
MDEF + 15
Increase resistance to Curse status by 30%.

What is the actual chance of the Bard being cursed?

P/S Would prefer calculations made based on eAthena. Thank you very much.