Datatables row grouping - how to add rowcount per group and expand/collapse all

HTML

<link rel="stylesheet" href="http://ajax.aspnetcdn.com/ajax/jquery.dataTables/1.9.0/css/jquery.dataTables.css">
<script src="https://cdn.datatables.net/1.10.7/js/jquery.dataTables.min.js"></script>

JavaScript

var a = 0.0273;

function normalizeNumber(n) {
    return n.toString().split('.').pop().length === 1 ? n.toFixed(2) : n; 
}
alert(normalizeNumber(a))

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Datatables row grouping - how to add rowcount per group and expand/collapse all

Datatables row grouping - how to add rowcount per group and expand/collapse all

HTML

JavaScript

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Console