I have adding numbers to get for corki and noticed his attack speed at 1 is .658. When I level him to 2, I get .658 + .015.
Here is the problem I add in (red) Marks 1.7% * 9 = 15% showing on my rune setup page but when I'm in game I only get 10% add or .1.
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.