function estimate()
{

bill = document.calc.bill.value;
 
bill2 = bill * 7500;

kwh = bill2 / 1991;

kw = kwh * 0.0072;
 
document.calc.kw.value = kw.toFixed(2);

cost = kw * 6055;

document.calc.cost.value = cost.toFixed(2);

federal = cost / 100 * 30;

document.calc.federal.value = federal.toFixed(2);

roof = kw * 100;

document.calc.roof.value = roof.toFixed(0);

save = bill / 100 * 75;

document.calc.save.value = save.toFixed(2);

pay = kw * 3;

document.calc.pay.value = pay.toFixed(0);

foot = bill * 48.6;

document.calc.foot.value = foot.toFixed(0);

oil = bill * 1.03;

document.calc.oil.value = oil.toFixed(0);

coal = oil * 21.43;

document.calc.coal.value = coal.toFixed(0);

tree = bill / 9;

document.calc.tree.value = tree.toFixed(0);

var kw2= kw.toFixed(2);
document.getElementById('kw2').innerHTML=kw2;

var cost2= cost.toFixed(2);
document.getElementById('cost2').innerHTML=cost2;

var federal2= federal.toFixed(2);
document.getElementById('federal2').innerHTML=federal2;

var roof2= roof.toFixed(0);
document.getElementById('roof2').innerHTML=roof2;

var save2= save.toFixed(2);
document.getElementById('save2').innerHTML=save2;

var pay2= pay.toFixed(0);
document.getElementById('pay2').innerHTML=pay2;

var foot2= foot.toFixed(0);
document.getElementById('foot2').innerHTML=foot2;

var oil2= oil.toFixed(0);
document.getElementById('oil2').innerHTML=oil2;

var coal2= coal.toFixed(0);
document.getElementById('coal2').innerHTML=coal2;

var tree2= tree.toFixed(0);
document.getElementById('tree2').innerHTML=tree2;

}