window.addEvent('domready', function() {  
	$('formula-1').addEvent('keyup', calculate);
	$('formula-2').addEvent('keyup', calculate);
		
	function calculate() {
		$('formula-3').value= (($('formula-2').value/4)*90000);
		$('formula-4').value= ($('formula-3').value-$('formula-1').value);
		$('formula-5').value= parseInt($('formula-3').value)+ parseInt($('formula-4').value);
	}; 
});