title: How to multiply two columns from two different table with eloquent in laravel
body: <p><strong>order</strong></p>
  
  <ul>
  <li>id</li>
  <li>currency_code</li>
  <li>ex_rate_with_base</li>
  <li>status</li>
  <li>total_in_base_currency</li>
  <li>status</li>
  </ul>
  
  <p><strong>currency</strong>  </p>
  
  <ul>
  <li>currency_code </li>
  <li>symbol</li>
  <li>currency_name</li>
  <li>currency_value</li>
  <li>ex_rate_with_base</li>
  <li>status</li>
  </ul>
  
  <p><strong>order_list</strong></p>
  
  <ul>
  <li>id</li>
  <li>order_id</li>
  <li>product_code</li>
  <li>qty</li>
  <li>unit_price_in_base_currency</li>
  <li>status</li>
  </ul>
  
  <p>I want the following output:</p>
  
  <p>Here I want to multiply the <code>ex_rate_with_base</code> field of <strong>order</strong> table with <code>unit_price</code> of <strong>order_list</strong> table using eloquent. </p>