$(document).ready(function()
{
    ltMemberTotal();
    secondMember();
    $('#input1, #input2').change(ltMemberTotal);
    $('#input1').change(secondMember);
});

function ltMemberTotal()
{
    var donation = $('#input2 option:selected').val();
    if($('#input1 option:selected').val() == '')
    {
        var cost = 0;
    }
    else
    {
        var costString = $('#input1 option:selected').text();
        var cost = costString.substring(costString.indexOf('£') + 1);
    }

    var total = (cost * 1) + (donation * 1);
    total = total.toFixed(2);
    total = '£' + total;
    $('#input3').attr('value', total);
}

function secondMember()
{
        if($('#input1 option:selected').attr('class') == 'joint')
        {
            $('.jointMem').show();
        }
        else
        {
            $('.jointMem').hide();
        }
    }