function sum() { var airTicket=Number($("input[ name='airTicket' ] ").val()); var transportationFee=Number($("input[ name='transportationFee' ] ").val()); var trainFare=Number($("input[ name='trainFare' ] ").val()); var hotelExpense=Number($("input[ name='hotelExpense' ] ").val()); var mealFee=Number($("input[ name='mealFee' ] ").val()); var baseFee=Number($("input[ name='baseFee' ] ").val()); $("input[ name='total' ]").attr("value",airTicket+transportationFee+trainFare +hotelExpense+mealFee+baseFee); }