How do you make an Luck Percentage?

while wait(5) do--Every 5 seconds will give it a new number
	local num = math.random(1, 100)--From 1 to 100 number will be chosen randomly
	if num > 0 and num <= 30 then--if the number is greater then 0 but less then or equal to 30 then you get Common
		print(num)
		print("You get Common")
	elseif num > 30 and num <= 60 then
		print(num)
		print("You get Uncommon")
	elseif num > 60 and num <= 80 then
		print(num)
		print("You get Rare")
	elseif num > 80 and num <= 90 then
		print(num)
		print("You get Epic")
	elseif num > 90 and num == 100 then
		print(num)
		print("You get Legendary")
	end
end

I am not the best explainer