Increasing/decreasing numbers by a percent?

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#1

I have a few systems in my game that increases/decrease numbers by a percent, however, when testing things I realized if the values are ever 1 it will never increase another thing I realized is I don’t think I’m calculating things right.

For demonstration, I have an ability that heals 3% of the player’s hp everytime they land a hit

local function Heal(humanoid,percent)
	humanoid.Health = Util:IncreaseNumByPercent(humanoid.Health,percent)
end

-- gets called when a hit is made
Class.Passive = function(humanoid)
	Heal(humanoid,3)
end

Here is the IncreaseNumByPercent function

local function decimalRound(num, places)
	local power = 10^places
	return math.round(num * power) / power
end

function Utils:IncreaseNumByPercent(number : number, percent : number)
	local result = number * (1 + (percent/100))--decimalRound(number * (1 + (percent/100)),0)
	return result
end

If the players health is 1 and they tried to heal it would stay at 1 which makes sense because math and also I know its only 3% but it only ends up at 1.03 I feel like that’s to low to be correct?

#2

Why are you adding 1? The actual value would be 0.03 but since you’re adding 1 it’s 1.03

Did you expect it to end up at 4?

Edit : By the way, 3% is decreasing someone’s health, 103% is increasing someone’s health.

#3

When I was looking up how to do this that was a formula I came across.

No, I just didn’t expect it to be 1.03. I know 3% wasn’t gonna be a lot, but still, 1.03 is a bit useless.

#4

The actual formula should be number * (percent / 100)

Ok, but 1.03 really is 103% of 1.