Do the different skills on the skill tree add to each other?

Question

In the bounty hunter: powertech skill tree, the skill puncture lets rail shot ignore up to 60% of your opponents armour and the skill superheated rail let you ignore 30% of your oppenents armour. So does the combination of these two skills mean that you are ignoring 90% of your opponents armour with each shot? or does the game calculate the values some other way?

Answer

I would have thought the answer was 72% (1-(1-.6)*(1-.3)), but all the sources I find seem to suggest that 90% is the correct reduction.

Citations: 1,2,3

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