MapleStory Unlimited: Ignore Mob Defence?

i just found out that the new kms ignore monster def it is multiplicative.............. but there good new is to get the best result of these ...

i have 2 option

option one

1. ignore 40% def main weapon potential 1st line
2. ignore 15% def main weapon potential 2nd line
3. ignore 40% from skill

option 2

1. ignore 30% def main weapon potential 1st line
2. ignore 30% def main weapon poetntial 2nd line
3. ignore 30% from skill

which is better ?

let take a example on first line ... and let fight a boss call cygnus which she has 70% ignore

taking from option 1 .... ignore 40% of 70% = 42% then ignore 15% of 42% = 35.7% then ignore 40% of 35.7% = 21.42% of your dmg will be ignore when attacking cygnus
taking from option 2..... ignore 30% of 70% = 49% then ignore 30% of 49% = 34.3% then ignore 30% of 34.3% = 24.01% of your dmg will be ignore when attacking cygnus

85% ignore > 90% ignore .......... LOL