by Stabber » Thu Mar 12, 2015 7:14 pm
Im_a_merchant beat me to it. I collected those values about a month ago, so they should still be accurate.
The Double Drop Rate payvault perk doubles the base drop chance, and each point of Luck adds 1 to the drop rate chance (luck is applied after double drop rate).
So a given item's drop rate is BASE_DROP_RATE * 2 (if you have double drop rate) + LUCK