JSFiddle - React, Tailwind, and code Playground

HTML

<form onsubmit = "go()">
   <table bordercolor='#b9cace' align='center' width='97%'>
      <tr height='35' valign=center align=center>
      <td>Сотни</td>
      <td>Десятки</td>
      <td>Единицы</td>
   </tr>
      <tr height='120'>
      <td><input type="radio" name="S" value="500">500<br>
          <input type="radio" name="S" value="400">400<br>
          <input type="radio" name="S" value="300">300<br>
          <input type="radio" name="S" value="200">200<br>
          <input type="radio" name="S" value="100">100</td>
      <td><input type="radio" name="C" value="50">50<br>
          <input type="radio" name="C" value="40">40<br>
          <input type="radio" name="C" value="30">30<br>
          <input type="radio" name="C" value="20">20<br>
          <input type="radio" name="C" value="10">10<br></td>
      <td><input type="radio" name="V" value="5">5<br>
          <input type="radio" name="V" value="4">4<br>
          <input type="radio" name="V" value="3">3<br>
          <input type="radio" name="V" value="2">2<br></td>
    </tr>
   </table>
   <input type="button" value="Проверить" onclick="go()">
   </form>
<span id="res">не выбрано</span>

JavaScript

function go() {
var rs= document.getElementsByTagName('input');
var res = 0;
for (i = 0; i< rs.length;i++)
{
if (rs[i].name == 'S' && rs[i].checked) res += parseInt (rs[i].value);
if (rs[i].name == 'C' && rs[i].checked) res += parseInt (rs[i].value);
if (rs[i].name == 'V' && rs[i].checked) res += parseInt (rs[i].value);
}
document.getElementById('res').innerHTML = res;
};