JSFiddle - React, Tailwind, and code Playground

HTML

<table>
  <thead>
    <tr>
      <td> Заголовок </td>
      <td> Заголовок </td>
      <td> Вес, кг </td>
      <td> Цена, руб. с НДС </td>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Текст</td>
      <td>Текст</td>
      <td class="weight">1.35</td>
      <td class="price"></td>    </tr>
    <tr>
      <td>Текст</td>
      <td>Текст</td>
      <td class="weight">2.53</td>
      <td class="price"></td>    </tr>
  </tbody>
</table>

CSS

table {
  background: gray;
}

td {
  padding: 1em;
  background: white;
}

JavaScript

const price = 42.99
const NDS = 1.2
const rows = document.querySelectorAll('table tbody tr')

rows.forEach(row => {
  const weightCell = row.querySelector('.weight')
  const priceCell = row.querySelector('.price')
  const weight = parseFloat(weightCell.textContent)
  priceCell.textContent = weight * price * NDS;
});