Adjusting damage dealt by a percentage

[Tezuni 2.0]

Is it possible to adjust damage dealt by a percentage?
For example, if I set my player to have a value of 900/1000 strength, would it be possible to make my player only deal 90% of the damage it regularly would?
How would I do this?

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[Destiny/Zack0Wack0]

Package the Armor::damage function and multiply the damage amount by 100th of the percentage. Search, there's heaps of these topics.