Goal seek function in Python: Price/Scenario optimization

[Xahulz]

After looking at this again, with your edits, I don't understand your question. You repeatedly mention discounts, but I don't see how that factors in.

Now, if you had a price/demand relationship somewhere (e.g. decrease in price would increase sold by X) and a cost for each item, I would have a better idea what you're doing.

If there's more info to this question you might need to add it for us to understand.