Updated FIDDLE
Jquery
function calcSubMTotal(p) {
var minus = 0;
var isFirst=true;
var minus_total = $('#' + p + '');
$('.' + p + '').each(function (i) {
if (!isNaN(this.value) && this.value.length !== 0) {
if(!isFirst)
minus -= parseInt(this.value);
else
{
minus=parseInt(this.value);
isFirst=false;
}
}
});
minus_total.val(minus);
}
$('input[type=text]').on('keyup', function () {
calcSubMTotal("rr");
calcSubMTotal("rr1");
calcSubMTotal("rr2");
calcSubMTotal("rr3");
});