var items = [ ['vara1', 100], ['vara2', 10]]
var total = 0

var myloop = function (items, mycallback) {
$.each(items, function(i, item) {
items[i] = myCallback.apply(this, [item]);
})
};

loop(items, function (items) {
// sum items together
});

loop(items, function (items) {
// display item
});