map() is your friend

gistfile1.js

/*
map() is cool!

This function essentially loops over each row of a table and puts
its data in an array of objects.

It returns something like this: 
[ 
{rate: 1.0, apy: 1.0, productLabel: '3 month CD', earnings: 123.45},
{rate: 1.12, apy: 1.13, productLabel: '6 month CD', earnings: 543.21},
...
]
*/

var rateData = myTable.find('tbody > tr').map(function () {
    var tr = $(this);
    return {
      rate: extractNumber(tr.children('.rate').text()),
      apy: extractNumber(tr.children('.apy').text()),
      productLabel: tr.children('.term').text(),
      earnings: extractNumber(tr.children('.earnings').text())
    };
});

var extractNumber = function (str) {
    return parseFloat(str.replace(/[^0-9.]/g, ""));
};