The % is the amount of attack added onto the basic stats. Like the stats woul find on the weps at the NPC
So say a glavie has 100-200 at the npc this is (+0%)
then if you found a glavie or bought one with 150-250 it will say (+50%)
or
A sheild at the NPC will be BR10 which is (+0%)
This means that each 1 increase in BR on the sheild gives an extra 10%
If you find one with BR 19 you can figure out the % without looking at it because 19 is 90% more than 10
so basically you dnt need to look at the stats but at the % only because they are both the same thing. "the higher the % the higher the atack stats.
Read this a few times and youl get it
