[Question] about item drop rate

DemonSlayer [Demon Cry] (+20% drop)
Bishop [Holy Symbol] (hyper skill +30% drop)
Accessory (+xx% Drop)
Family buff 1.2x drop
winter +50% drop

when on 2x drop coupon , which no stack ?



eq 60% drop rate [earring 20% + ring 20% + ring 20%] , will become 60% ? or 20% (no stack) ?


if i killing a boss , what drop buff should i do ? (below thoes thing)

2x coupon
demoncry +20%
hs +30%
accessory drop +60%
family 1.2x drop
winter +50% drop



pls help ..