If condition is not working for all td values?

i am working with html table, when i check the checkbox i want to compare td values in a every tr, this condition is working fine for 1st tr from 2nd tr the condition is not working.
HTML Code -

<form role="form" name="conForm" id="conForm">
                    <span id="error" class="text-danger"></span>
                    <div class="table-responsive">
                        <table id="myPTable" class="table table-xss table-hover table-bordered">
                        <thead>
                        <tr>
                        <th><input class="checkall" type="checkbox" name="productcheckbox"> All</</th>
                        <th class="control-label paddingtop">SI No</th>
                        <th class="control-label paddingtop">Products</th>
                        <th class="control-label paddingtop">Pending Qty</th>
                        <th class="control-label paddingtop">Quantity</th>
                        <th class="control-label paddingtop">Amount</th>
                        </tr>
                        </thead>
                        <tbody>
                        <tr>
                        <td><input class="checkbox checkproduct" type="checkbox" name="check"></td>
                        <td>1</td>
                        <td>HMIS HMIS HMIS HMIS</td>
                        <td class="availableQty">10</td>
                        <td><input  type="number" name="select[]" class="enterQty" value="10" style="width:50px;"></td>
                        <td>3000</td>
                        </tr>
                        <tr>
                        <td><input class="checkbox checkproduct" type="checkbox" name="check"></td>
                        <td>2</td>
                        <td>ERP</td>
                        <td class="availableQty">1</td>
                        <td><input  type="number" name="select[]" class="enterQty" value="1" style="width:50px;" ></td>
                        <td>9000</td>
                        </tr>
                        <tr>
                        <td><input class="checkbox checkproduct" type="checkbox" name="check"></td>
                        <td>3</td>
                        <td>Inventory</td>
                        <td class="availableQty">10</td>
                        <td><input  type="number" name="select[]" class="enterQty" value="10" style="width:50px;"></td>
                        <td>13000</td>
                        </tr>
                        <tr><td><button class="btn-info">Save</button></td></tr>
                        </tbody>
            </table>
            </form>

Here is the jquery code -

$(".btn-info").on("click",function(){
               
                var check = $('.checkproduct');              
                  if(check.is(':checked')){
                      
                      var pending="";
                      $('#myPTable tr').each(function() {
                        pending =+ $(this).find(".availableQty").html();    
                        console.log(pending);
                      });
                
                      var enterqty ="";
                      $('#myPTable tr').each(function() {
                        enterqty =+ $(this).find(".enterQty").val();
                        console.log(enterqty);
                      });

                      if(enterqty > pending){
                          $("#error").html("<p>Quantity must be less than or equal to Pending Qty</p>");                          
                      }else if(enterqty== 0){
                          $("#error").html("<p>you have checked the product please enter quantity</p>");
                        }
                              else{                          
                        var checked = $('.checkproduct:checked').size();
                      }

the jquery what i wrote is working for only first row, but it need to be work for every work which will be checked.now only you guys can help me, thanks in advance.