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Do they just want a template file? Do they want any documentation describing
the template? How many templates? For what type of documents? Any special or
unusual requirements such as paper size, printing constraints, corporate
style guide, use of color, online use, html conversion, etc.? and on and on.
Personally, I would charge my usual per-hour rate. Standard contract,
standard review cycle, business-as-usual. I don't charge less or more for
design than actual writing.
If you feel you must charge a flat rate for this project, be sure to get it
clear in writing what the client wants. I did this kind of work for a flat
fee once, but that was for a friend - sort of a return favor. It worked out
fine, but without all of the above (and probably more) spelled out very
clearly in black and white I wouldn't do it again.