Calculate difference/sum of label values using jQuery

Introduction:

In this post, find jQuery code to calculate difference in label/span values. To fetch the label/span value don't use .val() or .text() method, Instead use .html() method.

Example:

$(document).ready(function () {
    var nCost = $('#spnCost').html();
    var nSellingPrice = $('#spnSellingPrice').html();
    var nProfit = parseFloat(nSellingPrice) - parseFloat(nCost);
    $('#spnProfit').html(nProfit);
});