I'm trying to set up an inventory spreadsheet for my work, but i'm running into a snag.

What I want to do is have three columns that interact with eachother.

1. Units in stock
2. Reorder Level
3. Reorder Tolerance
4. Status

What I want, is to have the status column react in one of three ways. Either "In Stock", "Reorder Needed" and "Out of Stock".

So if units in stock is at 110, with a reorder level of 100, and a tolerance of 10%, I want the Status to show "Reorder Needed" with a red cell color. But if stock is at 111 or more, I want it to be shown as "In Stock". Zero should be "Out of Stock".

Any help would be appreciated.