It follows an ugly cubic poynomial exactly:
Ok me and my friend are trying to determine the function used on an online game.
When you build a level 1 metal mine, your production goes up to 22 metal and hour.
level 2 is 48
as i said before we are trying to find the exact function that is used, and i am having problems trying to do this, i think it has to do with the rate. i did plot a graph and it shows that it increases less as approaches infinity.
It doesnt sound that hard, i should be able to do it, though i cant remember how :S
Here are a table of values