Simple Scaling Question

["Walter R. Paczkowski" <dataanalytics@earthlink.net>]

Hi,

I have a simple scaling question.  A client wants to measure consumers' 
rating of how important are certain attributes of a product.  The scale 
he wants to show the consumers is 1 - 9, but then he wants to convert 
this to a +/-100 scale.  Converting to a 0 - 1 scale is no problem: take 
each consumer's rating of an attribute, subtract the mean for that 
attribute, and divide by the range.  But how can I do this to get 
+/-100?  Any ideas?
Thanks for the help,

Walt Paczkowski