About Skill Damages

I've never gotten this or bothered to understand since I started, but now I'm actually caring due to actually playing with thought.

When a skill says "Hits X times for Y%" does that mean it does:
A) X * Y% damage, with Y% represents the damage of a single hit
B) Y% damage over X hits and thus (Y% / X) gives % damage per hit

For example: "Deals 6 very quick consecutive attacks to a monster - Level 20: MP -26, Damage: 90%"
So does this mean it does
A) 6 * 90% and each hit is 90%?
or
B) 90% / 6 = 15% damage each hit?

I get the feeling if I cared more about math I'd not need to post this question.

It means A. Like Carrion Breath is 169% x4 = 676% total damage per time of holding it down

I see. Thanks, I now finally know and can be more confident in my skill comparisons.

Spoiler!

I originally thought this issue up in regards to Demon Slayer with respect to Dark Thrust vs. Chaos Lock, and which did more damage. Maxed Dark Thrust does less damage per hit but cumulatively does just over 3% more damage than maxed Chaos Lock... is what I calculated, then I actually used them, and now I'm back at square one for deciding which to not max.

Don't max chaos lock, you barely use it and sometimes it takes you places you didn't want to go. In the end you'll have 13/15 SP in chaos lock so it's near-max.