问选中复选框时，值价格不会换算

EN

<div class="price" id="amount">₹0</div>

<div class="check">
<label id="somede-div" class="first2" for="check-2"><input id="check-2" 
class="first" name="save2" type="checkbox" /><span class="checkbox">
</span>₹749<span id="somede-element">IBPS PO 2017 Mocks (20 Prelims + 10 
Mains)</span></label>
<label id="some-div" class="first0" for="check-0"><input id="check-0" 
class="first" name="save" type="checkbox" /><span class="checkbox">
</span>₹1999<span id="some-element">IBPS PO 2017 Online Coaching 
Course</span></label>
<label id="somed-div" class="first1" for="check-1"><input id="check-1" 
 class="first" name="save1" type="checkbox" /><span class="checkbox">
</span>₹2999<span id="somed-element">IBPS PO 2017 Online Coaching Course + 
30 Mock Tests</span></label>
<label id="somedef-div" class="first3" for="check-3"><input id="check-3" 
class="first" name="save3" type="checkbox" /><span class="checkbox">
</span>₹3499<span id="somedef-element" style="right: 9px;">IBPS PO 2017 
Online and Pendrive</span></label>
<label id="somedeff-div" class="first4" for="check-4"><input id="check-4" 
class="first" name="save4" type="checkbox" /><span class="checkbox">
</span>₹3999<span id="somedeff-element" style="right: 9px;">IBPS PO 2017 
Online and Pendrive + 30 Mock Tests</span></label>
<div class="mask"></div>
<div class="helping">Please select any one box</div>

$(document).ready(function() {

        var changePrice = function changePrice(amt, state) {
            var curPrice = $('.price').text();
            curPrice = curPrice.substring(1, curPrice.length);
            if (state == true) {
                curPrice = parseInt(curPrice) + parseInt(amt);
            } else {
                curPrice = parseInt(curPrice) - parseInt(amt);
            }
            //alert(curPrice);
            window.curAmount = curPrice;
            curPrice = '₹' + curPrice;
            $('.price').text(curPrice);

            //alert(curAmount);

        }

        $(function() {
            $('#check-0').on('change', function() {
                $(".helping").css("display", "none");
                var itemPrice = $('label[for="check-0"]').text();
                itemPrice = itemPrice.substring(1, itemPrice.length);
                changePrice(itemPrice, $('#check-1').is(':checked'));
                $(".first").attr("checked", false); //uncheck all checkboxes
                $(this).attr("checked", true);
                /* if ($('#check-0').filter(':checked').length >= 1) {
             changePrice(parseInt(curAmount) + parseInt(itemPrice));
    $('input.first').not(this).prop('checked', false);
           }*/
                //changePrice(parseInt(itemPrice) * parseInt(curAmount));

            });
            $('#check-1').on('change', function() {
                $(".helping").css("display", "none");
                var itemPrice = $('label[for="check-1"]').text();
                itemPrice = itemPrice.substring(1, itemPrice.length);
                changePrice(itemPrice, $('#check-1').is(':checked'));
                $(".first").attr("checked", false); //uncheck all checkboxes
                $(this).attr("checked", true);
                //alert(itemPrice);
            });
            $('#check-2').on('change', function() {
                $(".helping").css("display", "none");
                var itemPrice = $('label[for="check-2"]').text();
                itemPrice = itemPrice.substring(1, itemPrice.length);
                changePrice(itemPrice, $('#check-2').is(':checked'));
                $(".first").attr("checked", false); //uncheck all checkboxes
                $(this).attr("checked", true);
                //alert(itemPrice);
            });
            $('#check-3').on('change', function() {
                $(".helping").css("display", "none");
                var itemPrice = $('label[for="check-3"]').text();
                itemPrice = itemPrice.substring(1, itemPrice.length);
                changePrice(itemPrice, $('#check-3').is(':checked'));
                $(".first").attr("checked", false); //uncheck all checkboxes
                $(this).attr("checked", true);
                //alert(itemPrice);
            });

            $('#check-4').on('change', function() {
                $(".helping").css("display", "none");
                var itemPrice = $('label[for="check-4"]').text();
                itemPrice = itemPrice.substring(1, itemPrice.length);
                changePrice(itemPrice, $('#check-4').is(':checked'));
                $(".first").attr("checked", false); //uncheck all checkboxes
                $(this).attr("checked", true);
                //alert(itemPrice);
            });

        });