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Math behind attacks boost with Nick Fury and Black Widow Claire Voyant (BWCV) synergies

I have a question regarding how these specific synergies interact to change the attack value.
Assuming both are on your team, and using BWCV (who I believe is tagged as a hero), and using an attack of 100 as an example, how does the math work out?
NF should give BWCV a 10% attack boost, so her attack should now be 110 as a baseline for being on the team.
If she faces off against a villain opponent, is it an extra 10% of the base or 10% calculated based on the new total? (Meaning does she get an extra 10 on top of the 110 for a total of 120, or does she get an extra 11 for being 10% of 110 for a total of 121).
Difference seems negligible in my example but makes a difference at higher values, and certainly over the course of a fight.
For reference:
Black Widow Claire Voyant: Guilty Souls - All champions gain +10% attack when fighting against Villain Opponents.
Nick Fury: Nick's Leadership: All Hero champions except Nick: 10% Attack rating. This boost is doubled if Nick is Dead.
Assuming both are on your team, and using BWCV (who I believe is tagged as a hero), and using an attack of 100 as an example, how does the math work out?
NF should give BWCV a 10% attack boost, so her attack should now be 110 as a baseline for being on the team.
If she faces off against a villain opponent, is it an extra 10% of the base or 10% calculated based on the new total? (Meaning does she get an extra 10 on top of the 110 for a total of 120, or does she get an extra 11 for being 10% of 110 for a total of 121).
Difference seems negligible in my example but makes a difference at higher values, and certainly over the course of a fight.
For reference:
Black Widow Claire Voyant: Guilty Souls - All champions gain +10% attack when fighting against Villain Opponents.
Nick Fury: Nick's Leadership: All Hero champions except Nick: 10% Attack rating. This boost is doubled if Nick is Dead.
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Comments
So if your attack rating is 1000, a 10% attack rating buff increases that to 1000 * (1 + 0.1) = 1100. If you have another +10% attack rating buff your attack rating increases to 1000 * (1 + 0.1 + 0.1) = 1200. NOT 1000 * (1.1) * (1.1). That's "linear stacking" rather than "multiplicative stacking."
The alternate line of thought is if your attack rating is 1000, a +10% buff increases your attack rating by 100, 10% of 1000. So 1000 + 100. Another +10% buff increases your attack rating by another 100, another 10% of 1000, or 1000 + 100 + 100. That's the "buffs buff base value" line of thinking.
From: https://forums.playcontestofchampions.com/en/discussion/comment/1093565#Comment_1093565