how to make a bullets damage scale with a % from the player?

I'm trying to make a bullet use a % for damage that scales up or down. If that makes sense?

Something like this..

Base Damage * % = Damage of bullet to the targets health.

So..

10 * 50% = Bullet does 5 damage.

I'm not sure how to start this. How do I make the bullet use a % and use the base damage the player currently has to make the total damage?

Give the bullet an instance variable 'damage'.

When firing the bullet give 'damage' the value BaseDamage * (pct / 100)

You need some logic to give a value to 'pct' (%)

When the bullet hits, calculate damage based on 'damage'

It works! Thanks for helping! (love ya) :3