checkbox based input item

Give the inputs for the number of sets a name also: name="sets[]".
Remove the onChange part that you already have.

Then, in the jQuery part that starts with $(document).ready .. insert this:

Code:

    $("input[name='sets[]']").change(function(){
        row = $(this).parents('tr');
        n = $(this).val();
        f = row.find("input[name='india[]']").val();
        total = n * f;
        alert(total);
    });

Now, if you change any of the inputs with the name "sets[]", it will trigger a calculation.