JSFiddle - React, Tailwind, and code Playground

HTML

<form id="form1" method="post" action="">
  <p>
    <select name="ha" id="ha">
            <option value="0" selected>예매좌석 선택</option>
            <option value="200000">가</option>
            <option value="180000">나</option>
            <option value="150000">다</option>
            <option value="140000">라</option>
            <option value="120000">A1</option>
            <option value="100000">A2</option>
            <option value="100000">A3</option>
            <option value="100000">B1</option>
            <option value="100000">B2</option>
            <option value="100000">B3</option>
        </select>
  </p>
  <p>
    <select name="ha" id="ha">
            <option value="0" selected>예매좌석 선택</option>
            <option value="200000">가</option>
            <option value="180000">나</option>
            <option value="150000">다</option>
            <option value="140000">라</option>
            <option value="120000">A1</option>
            <option value="100000">A2</option>
            <option value="100000">A3</option>
            <option value="100000">B1</option>
            <option value="100000">B2</option>
            <option value="100000">B3</option>
        </select>
  </p>
  <p>
    <select name="ha" id="ha">
            <option value="0" selected>예매좌석 선택</option>
            <option value="200000">가</option>
            <option value="180000">나</option>
            <option value="150000">다</option>
            <option value="140000">라</option>
            <option value="120000">A1</option>
            <option value="100000">A2</option>
            <option value="100000">A3</option>
            <option value="100000">B1</option>
            <option value="100000">B2</option>
            <option value="100000">B3</option>
        </select>
  </p>
  <p>
    <select name="ha" id="ha">
            <option value="0" selected>예매좌석 선택</option>
            <option value="200000">가</option>
            <option value="180000">나</option>
           ...

JavaScript

$(function() {
  var fields = $('#form1 :input').change(calculate);

  function calculate() {
    var price = 0;
    fields.each(function() {
      price += +$(this).val();
    })
    var finalanswer = price.toString();
    $('#price').html(finalanswer.replace(/\B(?=(\d{3})+\b)/g, ","));
  }
})