There is great detail on this subject in section 5.5 of the Newbie FAQ:
http://www.shrapnelgames.com/cgi-bin...;f=23;t=009760
Hope it gets again stickified soon!
Anyway, just to be clear, the 50% increase per retrofit applies to
total resources needed before and after, not to each resource:
Total M+O+R after retrofit can be no greater than 1.5 x Total M+O+R before retrofit.
Slick.