When it comes to specific questions that require specific math. This isn't enough to go on for your situation, but I can invent something approximate I believe:
Order of Events:
Player has ~200 sets of Econ Signals and ~300 sets of Dragon Signals.
Player purchased 30 Each of Econ Signals
Player has ~230 sets of Econ Signals and ~300 sets of Dragon Signals.
Using this Calculation from DevBlog 327: https://docs.google.com/spreadsheets/d/1QdYhvYMu6gsUSMS7Hag3Gwpnwn7LD2XvJeiqFeIG1y4/edit?usp=sharing
Initial Amounts:
Mid-Point -> End-Point:
-- and -- converts into -->
Totals Results (remembering 1 of each are given free as baseline):
Credits
54 x +40%
288 x +160%
Ship XP
260 x +200%
202 x +800%
Commander XP
54 x +200%
154 x +800%
202 x +1600%
Free XP
69 x +300%
70 x +600%
17 x +2400%
202 x +7200%
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Addition of 30 each Econ Signal:
Mid-Point -> End-Point:
-- and -- converts into -->
Totals Results (remembering 1 of each are given free as baseline):
Credits
39 x +40%
293 x +160%
Ship XP
185 x +200%
233 x +800%
Commander XP
38 x +200%
109 x +800%
232 x +1600%
Free XP
49 x +300%
50 x +600%
12 x +2400%
232 x +7200%
Difference:
Credits
-15 x +40% (-600%)
+5 x +160% (+800%)
Difference: +200%
Ship XP
-75 x +200% (-15,000%)
+30 x +800% (+24,000%)
Difference: +9,000%
Commander XP
-16 x +200% (-3,200%)
-45 x +800% (-36,000%)
+30 x +1600% (+48,000%)
Difference: +8,800%
Free XP
-20 x +300% (-6,000%)
-20 x +600% (-12,000%)
-5 x +2400% (-12,000%)
+30 x +7200% (+216,000)
Difference: +186,000%
Without specific values, this is the best approximation I have for your example.
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Note:
30 x +20% Credits would equal +600% overall, but the +200% Credit net gain doesn't reflect that. Most likely there is rounding involved where the additional signals are being "lost" in the upward conversion to the +160% Bonuses.
Possible Areas of Influence:
Currently, full Signal Sets provide +145% in credits, so each "set" is rounded up an additional 15% when giving a +160% Bonus.
+40%'s and +50% roll into +160%s by combining their amounts and extrapolating totals:
(77 x 20%)40% = 38.5 = 38 + round up...
39 x +40%
(151 x 40%)160% = 37.75 = 37 + round up...
(71 x 50%)/3 = 23.6 = 22 + round up...
38 + 24 + (231 from sets) = 292
Note: +50% is 3-to-1 when combined to +160%. Each three yields 150% which is rounded up to +160%