let
    var rate := 2

    function getCost(total:int):int =
	(
	let
		var newrate := 10
		function getExtra() = 
		(
		  if(total > 100) then rate:= 5 else rate := rate
		)
	in
	  getExtra();newrate*total*rate
	end
	)

in
	getCost(250) + 20
end