javascriptで複利計算プログラム

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

<style>
body{
  padding:10px;
}
</style>
<script type="text/javascript">
      function Calculator() {
        rate = document.myform.rate.value;
        amount = parseInt(document.myform.amount.value, 10);
        period = parseInt(document.myform.period.value, 10);
        // document.myform.receipt.value = fukuri(rate, amount, period);
        tesuu = document.myform.tesuu.value / 100;
        receipt = fukuri(rate, amount, period,tesuu);
      }
 
      function fukuri(rate, amount, period,tesuu) {
        var receipt;
        receipt = amount;
        var str = "";
        str += "<table class=table>";
        str += "<tr><th>預入期間</th><th>元金＋利益</th><th>運用手数料</th><th>最終合計</th></tr>";
 
        //預入金額＝元金×(1＋金利)/100
        //Math.round：小数点以下を四捨五入
        for (var i = 1; i <= period; i++) {
          receipt = Math.round(receipt * (1 + rate / 100));
          tesuu2 = parseInt(tesuu * receipt , 10);
          last = receipt - tesuu2;
          str += "<tr><td>" + i + "年</td><td>" + receipt + "円</td><td>" + tesuu2 + "円</td><td>" + last + "円</td></tr>";
          receipt = last;
        }
 
        str += "</table>";
        document.getElementById("result").innerHTML = str;
        return receipt;
      }
 
      function TableClear() {
        document.getElementById("result").innerHTML = "";
      }
    </script>
 
    <form name="myform">
    <table class="table">
        <tr>
          <th>金利</th>
          <td><input type="text" name="rate" size="22" value="5" />％</td>
        </tr>
        <tr>
          <th>金額</th>
          <td><input type="text" name="amount" size="22" value="1000000" />円</td>
        </tr>
        <tr>
          <th>期間</th>
          <td><input type="text" name="period" size="22" value="10" />年</td>
        </tr>
        <tr>
          <th>運用手数料</th>
          <td><input type="text" name="tesuu" size="22" value="0.1" />%</td>
        </tr>
        </table>
        <input type="button" onclick="Calculator()" value="計算" />　<input type="reset" onclick="TableClear()" value="クリア" />

    </form>
    <hr />

    <div id="result"></div>