Up to date beta patch info..

[Drake]

That's the way the system is now though...

If you have a 20% mineral bonus, 20% from happiness, 10% from population, 30% from a planet facility, and 30% from a system facility, you don't get +110%. The bonuses you see in the abilities window of your planet are summed (+50% in this case), and the facility and system facility bonus are applied in turn. That ends up being (production + 50% bonus) = 1.5x production. Then 1.5 * 1.3 * 1.3 = 2.535, or a bonus of 153.5%. At least, that's what I've found when doing testing trying to max my score.

-Drake