How does MF % work with multiple people?

magic find/rarity find whatever u wanna call it

say theres a group of 6 people. how much more mf% do u get with that group than solo?

The character that gets the last hit on the monster.

let´s say you have:

-100% rarity find
-50% quantity find

the group modifier for 6 party members is 250% quantity find

if you land a killing blow on a monster you get the following:

-100% iir
-300% iiq

this will get multiplied with the base drop chance of the monster
a white monster for example has 16% base quantity