var feb = new Array(95,135,205,280,295,325,365,425,480,575);
var mar = new Array(46,69,78,156,188,252,289);
var apr = new Array(42,63,71,142,171,229,263);
var may = new Array(37,56,64,128,154,206,236);
var jun = new Array(33,50,57,113,137,183,210);
var jul = new Array(29,44,50,99,120,160,184);
var aug = new Array(25,38,43,85,103,138,158);
var sep = new Array(21,31,35,71,85,115,131);
var oct = new Array(17,25,28,57,68,92,105);
var nov = new Array(63,94,106,213,256,344,394);
var dec = new Array(58,88,99,198,239,321,368);
var jan = new Array(54,81,92,184,222,298,341);

var adm = 15;


function calc() {

var x = "";
var y = "";
var mselect = "";
var mopt = "";
var eselect = "";
var z = "";
var mselect = document.getElementById('month');
var mopt = mselect.options[mselect.selectedIndex];
var eselect = document.getElementById('employees');
var eopt = eselect.options[eselect.selectedIndex];

var x = "feb";
var y = parseInt(eopt.value,10);


if (x == "jan") var z = jan[y];
if (x == "feb") var z = feb[y];
if (x == "mar") var z = mar[y];
if (x == "apr") var z = apr[y];
if (x == "may") var z = may[y];
if (x == "jun") var z = jun[y];
if (x == "jul") var z = jul[y];
if (x == "aug") var z = aug[y];
if (x == "sep") var z = sep[y];
if (x == "oct") var z = oct[y];
if (x == "nov") var z = nov[y];
if (x == "dec") var z = dec[y];


if (document.getElementById('charity').checked == true) {
var z = (parseFloat(z,10) * 0.8);
var z = (z.toFixed(0));

}

var z = (parseFloat(z,10) + parseFloat(adm,10));

document.getElementById('fee').value = z;
}