Oh yes, the "Algebra" Purrk. To clarify: every achievement and Rank has their bonus and/or effect increased by 45% multiplicatively. While most Ranks went up from 20% to 29%, others received bonuses that were seemingly too high.
But I'll try to explain why Devoted Supreme displays 190% instead of 145%: an increase of 100% means you now make double the amount than you did before, so your revenue is now 200%. If the bonus would be calculated with 100%, then the bonus would be 145%. But this results in the actual revenue being 245%. It should be 290% for the bonus to actually be buffed by the "Algebra" Purrk.
I hope it is understandable this way :D
As for Achievements, I'll get the decimals back, it works for scientific notation, but not for standard notation for some reason.
Thanks for the suggestion of activating another Rank! I'll write that down to implement in the future :)