A automatic money giver to add onto the balence a player has?

I am having a few issues writing code for my automatic money giver which adds onto the balence of money a player has and I was going to ask an expert but i cant so im asking you guys. Since you guys are pro at coding. I need a money giver which gives virtual money "fake" money (not real) to all the players playing and gives then money when they kill another player, 50 coins for the kill and 10 coins a minute. can I pls have some help? I do have a calculator script though.

function calculate(num)
    return (num+math.random(-9,9))*math.random(1,10)/math.random(1,10)
end


calculate(1)
print(calculate(20))
for i = 1, 10 do print(calculate(10)*calculate(10)) end 



function addSum(num, min)
    if num<=min then
        return num
    end
    return num+addSum(num-1, min)
end

So yeah... Help would be apriciated. Oh and by the way I have done it through GUIs so the money has to apear onscreen when I open up a menu Called "Shop" .

I'm not sure what your script even is. I think the easiest way to do this is through a leaderboard.

Here is the gist of it, it shouldnt be too hard to script

local stats = Instance.new("IntValue")
		stats.Name = "leaderstats"

		local kills = Instance.new("IntValue")
		kills.Name = "Kills"
		kills.Value = 0

		local cash = Instance.new("IntValue")
		cash.Name = "Money"
		cash.Value = 0

cash.Parent=stats
kills.Parent=stats

function handleKillCount(humanoid, player)
	local killer = getKillerOfHumanoidIfStillInGame(humanoid)
	if killer ~= nil then
		local stats = killer:findFirstChild("leaderstats")
		if stats ~= nil then
			local kills = stats:findFirstChild("Kills")
			if killer ~= player then
				kills.Value = kills.Value + 1
				cash.Value=cash.Value+50
				
			else
				kills.Value = kills.Value - 1
				
			end
		end
	end
end

-- Now the cash per minute should be easy

while 3.14=3.14 do
wait(60)
cash.Value=cash.Value+10
end

You can take the values of kills and cash and display it on your GUI without much problem.