Thank you for your help everyone. Please ask if you have any questions, but please not in this forum thread. You can leave any questions you might have on my message wall or any other staff's message wall.
Everyone please note that unless you are going to feed your dragon all the way to 20, there isn't much point in feeding it at all, because to get the level 20 earning rate *someone* has to get their dragon all the way to 20, and that person had to go through all the previous levels to get to 20 and can get all the information in one fell swoop, thus rendering feeding a dragon to 16 or 17 for the earning rate redundant.
The individual steps are all identical. From level 0 to level 1 the increase in earning rate is the same as the increase in earning rate from level 19 to level 20...
All that is required is a calculator. And a bit of time.
Edit: apparently in some cases the increase from one level to the next differs one unit; as if rounding takes place. It should still be quite easy to determine the various rates. All that would need to be done is to assess what the pattern is for levels 0 to 15 and extrapolate this for the next five.
Do you have an example of one that doesn't? Obviously I didn't check them all, but the ones I did check are all very straightforward.
I would be curious to know one that is irregular: it would shed an entirely different light on the game. There is so much (mathematical) logic in the most unusual places.
Since I checked a few dragons and they all did not follow a concrete pattern (mostly being 1 off), I think it would be better to wait until we get the rates from leveling the dragons in-game, opposed to trying to calculate the rates and risk being off by a few coins.
I posted a chunk of level 20 earning rates. I had leveled them up before learning y'all needed the rate info. Maybe it was a waste of time to enter them without the other level data? Oh well. Just trying to help. 🤓