JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    
    <title>Document</title>

    <script src="https://code.highcharts.com/highcharts.js"></script>
    
    <script src="https://code.highcharts.com/modules/exporting.js"></script>
    <script src="https://code.highcharts.com/modules/offline-exporting.js"></script>
</head>

<body>
    <label for="">Equipment cost</label> <br>
    <input type="text" id="total-val">

    <br><br>
    <label for="">Tax</label> <br>
    <select name="" id="tax">
      <option value="10">10%</option>
      <option value="12">12%</option>
      <option value="21">21%</option>
      <option value="22">22%</option>
      <option value="24">24%</option>
    </select>

    <br><br>
    <label for="">Period</label> <br>
    <select name="" id="period">
      <option value="24">24 Months</option>
      <option value="36">36 Months</option>
      <option value="48">48 Months</option>
      <option value="60">60 Months</option>
      
    </select>
    <br><br>

    <label for="">Monthly Payments</label> <br>
    <input type="text" readonly id="monthly_payment">

    <br><br>

    <label for="">Savings</label> <br>
    <input type="" readonly name="" id="savings">

    <br><br>
    <label for="">Actual</label> <br>
    <input type="" readonly name="" id="actual">

    <br><br>


    <button id="submit">Submit</button>

    <br><br>


    <div id="container" style="width:100%; height:400px;"></div>
    

    <script src="https://code.jquery.com/jquery-3.6.0.min.js"
        integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
    <script>
        var total;
        var total1;

var chart;
        var tax;
        var period;
        var amort;
        var monthly;
        var amort_data = [];
        var lease_data = [];
        var wow_saving =...