RPS calculation isn't right. For example I have right now 95 Choppers at 44,525 rps per unit, 4,230M rps from all units but my rps in the game says 2,663M.
Make sure you buy the upgrades in the shop. I didn't click on it until I was almost giving up on getting gold in survival mode. Getting all the extras makes a world of difference.
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Hi buxtehude. We recently changed the way that the prestige works and the tooltip is showing the old formula. It will be fixed next patch.