I'm trying to write a formula that will predict any number along a curve if I
provide the x coordinate. Specifically, I'm a salesman and I have a product
that is less expensive the more you buy. in other words, the price per unit
becomes flatter in higher quantities, but is very steep in lower quantites.
I have lots of data points on this curve at general quantites: 1000, 2000,
3000 etc. I want to write a formula that calculates the coresponding
price/unit for whatever quantity I input (eg: 2374) based on the curve. Any
suggestions?