5 red science ass-2
6 green science ass-2
12 science pack 3 ass-2
=> 5 pumpjack ass-2 (10 seconds -> 5 seconds)
=> 5 steel * 0.75 seconds = 3.75 steel per second
=> 3.75/(2/17.5) = 32.82 e-/steel-furnaces for steel and the same amount for iron = 65.63
+ 26.25 iron plates per second = 45.94 e-/steel-furnaces
+ 5.625 copper plates per second = 9.85 e-/steel-furnaces
That's a lot for just science pack 3. Before you needed:
=> 0.5 assembler-1 ass-2
=> 8.25 iron plates per second = 14.44 e-/steel-furnaces
=> 1.69 copper plates per second = 2.96 e-/steel-furnaces
That's an increase for the number of furnaces of ((65.63+45.94+9.85)/(14.44+2.96) = 6.98) = 598%. I don't think that science pack 3 should be that expensive considering what it unlocks. Science costs should only vastly increase after science pack 3.