create a calculate prices with vat and without vat in swelt in javascript

Here is a simple example of how to calculate prices with VAT and without VAT in Svelte using JavaScript:

<script>
  let priceWithoutVat = 100;
  let vatPercentage = 20;

  function calculatePriceWithVat() {
    return priceWithoutVat * (1 + vatPercentage / 100);
  }

  function calculateVat() {
    return priceWithoutVat * (vatPercentage / 100);
  }
</script>

<div>
  Price without VAT: {priceWithoutVat}
</div>

<div>
  Price with VAT: {calculatePriceWithVat()}
</div>

<div>
  VAT: {calculateVat()}
</div>
406 chars
25 lines

In this example, we have a priceWithoutVat variable and a vatPercentage variable. We then define two functions calculatePriceWithVat and calculateVat that use these variables to calculate the price with VAT and the VAT amount.

We then use these functions to display the results in the HTML using Svelte's curly brace syntax.