Talk:Architecture (Age of Empires II)/@comment-180.254.41.30-20170130152141/@comment-65.28.183.104-20190812073657

Its simple, 100x1.1x1.1=121. The bonuses are cumulitive as opposed to simply stacking (100x1.1+100x1.1). This is true for all bonuses, such the Speed Bonus to Ships from Dry Dock and the Civ Bonus of the Berbers, or the bonuses of Mahouts and Husbandry for Persian War Elephants.

Ironically, Hoardings increases Castle health by 21% as a result of the cumulative addition of bonuses as to (I assume), provide a health bonus to Castles equal to Masonry and Architecture combined. In AoK, it was +1,000 hp or 20.83%. After that it was rounded up to 1,008 or 21.0%.