function $$$(id) { return document.getElementById(id) }

function calc() {
	$$$('inq-09').value = hoge();
}

function hoge() {
	var cd = {
		'inq-08-00' : 2500,
		'inq-08-02' : 3000,
		'inq-08-03' : 3150,
		'inq-08-04' : 3000,
		'inq-08-05' : 3000,
		'inq-08-06' : 3000,
		'inq-08-07' : 2500,
		'inq-08-08' : 4200
	};
	var val = 0;
	for (var i in cd) {
		val += $$$(i).value * cd[i];
	}
	return val;
}