Board Thread:Dragon City Questions and Answers/@comment-5995241-20130501190000/@comment-8951121-20130502111529

Sorry that's not wright.15 x 80 % = 1200 %. You can't get a 80 % bonus to all 15 lvl 20 Legendary Dragon, they experimented I think and the MAXIMUM boost you can get is around 860 - 880 % .