how to create a percentage macro?

Hello everyone. I wonder if there is how to create an attack macro with these functions in 5e? 1d20 + Mod + Proficiency + or - 20%, 50%, 90% and so on, making players less likely to hit their opponent.

For example, an enemy from 18 BC and the player rolls the die and from 19 and his weapon is a cutting type, but the enemy has + 20% resistance to cutting damage, so he would take 19-20%, so the account would be 19 * 20/100 = 3.8 so his 19 drops to 16, so if you have a way to do this in macro with api or without api, could you help me?

PS: I'm sorry if I have an error I'm not a native

Is the Resistance stored as an Attribute, or entered as a Query? You could do something like this, with example rolls:

[[ [[(1d20 + ?{Attack Bonus|5}[ATK]]])*(1-?{Enemy Resistance %|0}/100)]]

or you could output all the information from the roll:

&{template:default} [[ floor([[1d20 + ?{Attack Bonus|5}[ATK]]]*(1-?{Enemy Resistance %|0}/100)) ]] {{name=Attack Roll}} {{Base Attack=$[[0]]}} {{Resistance=?{Enemy Resistance %}%}} {{Final Roll=$[[1]]}}

Oosh said:

Is the Resistance stored as an Attribute, or entered as a Query? You could do something like this, with example rolls:

[[ [[(1d20 + ?{Attack Bonus|5}[ATK]]])*(1-?{Enemy Resistance %|0}/100)]]

or you could output all the information from the roll:

&{template:default} [[ floor([[1d20 + ?{Attack Bonus|5}[ATK]]]*(1-?{Enemy Resistance %|0}/100)) ]] {{name=Attack Roll}} {{Base Attack=$[[0]]}} {{Resistance=?{Enemy Resistance %}%}} {{Final Roll=$[[1]]}}

thank you friend. in this macro would you like to put amount of attack in a choice box, to make the player choose how many times he attacks so that the screen is very polluted?