Suppose I am wearing a 15% XP boost ring. In this war season, XP is doubled. Does that mean my total XP for a war season raid is (100*2)+15 = 215%? Or (100+15)*2 = 230%?
And suppose I am wearing two XP boosts, say a ring and a pair of boots. One is say 15% and the other 10%. Does that mean my total XP per raid is 100+10+15 = 125%? Or (100+10)*1.15 = 126.5%?