Maplestory help on 2x exp coupons?

ok so my friend owes me 8k nx and he's buying a 10k nx card on friday i was wondering how many times can the 2x exp cards be used i mean if you buy like 4 2x exps at the same time or around do they all multiply each other? like say those 4 2x exp would equal 16x exp or would it add each other like building bloacks like 8x exp or does it not even multiply at all or build on each other? btw i would also like to know if there waqs an event would it also work then with the same effect?Maplestory help on 2x exp coupons?
2x exp do not stack with each other so no. However, event and 2x exp card can stalk up.

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