Skill [Combo damage enhancement]

Skill text : Increase the damage modifiers of the second and third swings by respectively. 


Description: Set the first attack damage to 100%. Set the second attack damage to 50% (combo skill required). Reduce the attack damage of the third strike to 25% (Combo skill Lv2 required). This skill increases damage after the second strike.
Increase the damage modifiers of the second swings by X%. The value of X is skill LV x 20. Increase the damage modifiers of the third swings by Y%. The value of Y is skill LV x 60.
LV1=50x1.2=60% ; 25x1.6=40%
LV2=50x1.4=70% ; 25x2.2=55%
LV3=50x1.6=80% ; 25x2.8=70%
LV4=50x1.8=90% ; 25x3.4=85%
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Gundam: Battle Operation 2 Wiki : Strategy and Mechanics : Basic Mechanics : Melee Directions, Damages, and Combo Damage. 
I referred to this article.