1 attack is 3.33% damage. Drill however, ought to multiply with it instead of add. That is damage = base*(1+.0333*(A-D)). If you have +25% damage to that flat out, than that entire thing is multiplied by 1.25. If you increase attack by 7 (about 25%) you are increasing the damage only by 25% of the BASE damage.
Example:
Unit with 45 attack, 2.5 average damage attacks something with 15 defense.
2.5*(1+.0333(45-15)) = 2.5*(2) = 5 damage.
If we increase by 7 attack
2.5*(1+.0333(52-15)) = 2.5*(2.2333) = 5.58 damage
As opposed to adding the drill
5*1.25 = 6.25 damage
As you can see the comparison of additional multiplier to bigger existing ones isn't as straight forward as it looks.
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