User blog comment:Thecheme/Odds of opening a specific rarity of card based on chest and arena./@comment-10955477-20160129052853

Just a heads up, Thecheme - here is an Official Update note, from the Clash Royale Forums, regarding the new amounts of Chest Gold:

"BALANCE - Chest Gold: To keep the Gold economy intact and compensate for the free Battles, chests will give slightly less Gold "

Post-update, the current data regarding the Gold-per-chest will have to be cleared, in compensation to the future amounts of Gold which will be rewarded from Chests.