the .75 means multiply the time by .75

for example: a unit takes 8 seconds to train normally, so it takes 6 seconds to train after the upgrade is researched.

8 seconds x .75 = 6 seconds

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A Halo Wars Story: Once upon a time, there was a light bridge. On that light bridge, there were many covenant. When the UNSC turned the bridge off, the covenant fell. The End.