I am looking for a way to keep a cell's formula equation above or equal to 0 AND condition it to change color above 0.01, in example:

I want A3 formula to subtract A2 [10.50] from A1 [3.50], in which it [A3] would equal [-7.00], so to keep it at 0, NOT -7.00 (without switching A2 with A1 in the formula) AND be able to color change [A3] when the equation is above 0.01 (given A1's number is higher than A2's).

OR

Keep A3 at 0.00 if lower than 40.00 AND color change when above 0.01

Basically, I am calculating hours in A3's column based on A2's column subtracting A1's column, and dont want A3's column to drop below 0.00 as it is an over time hours column and still be able to color change when above 0.01. A2 = base hours, A1 = time card hours, and A3 = over time hours (based on a 40 hour work week) - keeping A3 at 0.00 unless A2-A1 equaled above 40.

It's probably a lot simpler than I know, so if theres any help out there or if someone can point me to a thread with a smiliar question, that would be great. I would be more than happy to upload pictures for referencing.

Thank you so much!