function calculatorInit() {
    $("#volume").change(function() {
        var volume = $(this).val();
        var size;
        var watts;
        var earning;
        switch (volume) {
            case '10':
                size = 1;
                watts = 1600;
                earning = 3360;
                break;
            case '20':
                size = 2;
                watts = 3200;
                earning = 6720;
                break;
            case '30':
                size = 3;
                watts = 4800;
                earning = 10080;
                break;
            case '40':
                size = 4;
                watts = 6400;
                earning = 13440;
                break;
            case '50':
                size = 5;
                watts = 8000;
                earning = 16800;
                break;
            case '60':
                size = 6;
                watts = 9600;
                earning = 20160;
                break;
            case '70':
                size = 7;
                watts = 11200;
                earning = 23520;
                break;
            case '80':
                size = 8;
                watts = 12800;
                earning = 26880;
                break;
            case '90':
                size = 9;
                watts = 14400;
                earning = 30240;
                break;
            case '100':
                size = 10;
                watts = 16000;
                earning = 33600;
                break;
            default:
                size = '';
                watts = '';
                earning = '';
                break;
        }
        $("#sizeText").text(size);
        $("#wattsText").text(watts);
        $("#earningText").text(earning);
    });
}