Thats not 105%, because chances dont work that way. You cant just add them up. There are 3 checks. You have 15 % to do epic. If it fails, another check 30% legendary and if it fails 60% rare. Chances that all 3 fail are 0,85*0,7*0,4=23,8%. Not big, but 1/4 you get normal item. And thats just average. That means somebody can get 3 times in row nothing, somebody can get 3 times in row epic.