[dogscoff]

Not sure I fully understand your question, but I can tell you this: The percentage multipliers in SE4 aren't multiplied together as you would mathematically expect percentages to be, but are added. Let's look at combat bonuses (they all work the same)

Suppose you have
50% basic to-hit chance
+20% experience
+20% sensors.
-10% enemy ECM

In this case your chance of hitting would be 50+20+20-10=80% chance of hitting, rather than 50 *120%=60%*120%=72&*90%=65% or anything like that.

Like I say, all percentages in SEIV stack in this manner, including construction rate bonuses.

Hope this helps.