From the wiki: The total resource costs and upgrade time are determined by the target level to which the units will be upgraded. Upgrading costs 50% of the production cost and takes 50% of the production time of the target level."
So does that mean if you upgrade from level 1 to level 3 the cost is 50% of building a level 3, or does that mean the cost is (50% to level 2 + 50% to level 3)?
So does that mean if you upgrade from level 1 to level 3 the cost is 50% of building a level 3, or does that mean the cost is (50% to level 2 + 50% to level 3)?