A little while ago I asked this question on SuperUser:
I wanted to find a formula for pricing my products in spreadsheets, so that I could price them fairly such that the more usage would have more discount.
However, based on the answers, I found out that the resulting chart would be something like this:
Which is absolutely wrong. Because it financially means that "if you buy 4000 units you should pay more than when you purchase 8000 units". Of course it doesn't make sense. Now I'm trying to find the data series that can create an increasing amount of payment which results to a linear pattern. But I can't figure it out, and my mathematical knowledge is not helpful here.
Where can I ask questions of this kind?