The slash or “/” is usually deployed when you need a quick and dirty way of saying “and” or “or.” Examples: “writer/director” and “and/or.”
But, one reader asks, how do you make such phrases possessive?
For example, which of these is correct:
If a zone/region’s 2010 results already exceed its target ...
If a zone’s/region’s 2010 results already exceed its target ...
If you view the slash as another way of saying “and”—which is the predominant view, found in Merriam-Webster and the Chicago Manual of Style—then you’d write “zone’s/region’s.”
But we like the advice found in several style manuals, which essentially urge writers not to use a slash when a different phrase would be clearer.
In other words, rewrite the sentence. Example: “If the 2010 results of a zone or region already exceed its target ...”
It takes a little effort to rethink the sentence. In doing so, though, you accomplish the ultimate goal of business writing: Make it easy for the reader. Avoid confusing her with a phrase that looks strange.