See attached efficiency charts. I've been asked to add a percentage value to the "Actual Hours" bar. The percentage would be calculated as (1 - [("Est Hours" - "Actual Hours") / "Est Hours"]) * 100 and this value should appear near the "Actual Hours" bar. Is this possible? If so, please advise as to how.
There are several methods. For your case, I think the simplest method is to use the Layer.addCustomGroupLabel (for labels outside the bar) or Layer.addCustomDataLabel (for labels inside the bar). For example, in VB/VBScript, it is like:
For i = 0 To UBound(labels)
myLabel = .... compute the text label ....
Call layer.addCustomGroupLabel(2, i, myLabel, "arial.ttf", 8, &H000000)
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(Ray Helinski) 
Add percentage value