Keep getting "attempt to perform arithmetic on a string value"?

Error Players.Spiik3yViinH.PlayerGui.Radio.Wallet.Text.LocalScript:5: attempt to perform arithmetic on a string value

Local Script

while wait(0.1) do
	local amount = game.ReplicatedStorage.GetMoneyValue:InvokeServer("Timer")
	script.Parent.Text = "You will be payed 300 KR in "+amount+" seconds"
end

Server Script

local moneyfolder = game.ServerStorage:WaitForChild("Cash")

game.ReplicatedStorage.GetMoneyValue.OnServerInvoke = function(p,valuename)
	local playerfolder = moneyfolder:FindFirstChild(p.Name)
	local value = playerfolder:FindFirstChild(valuename)
	return(value.Value)
end