title: Adding Tax to Shipping in Opencart
body: <p>How do you add tax to a shipping amount on Opencart?</p>
  
  <p>I obtain the following checkout summary on my site:</p>
  
  <p>Sub-Total:  £332.50
  Delivery Zone 1:    £49.99
  VAT (20%):  £66.50
  Total:  £448.99</p>
  
  <p>Delivery is £49.99 inclusive of VAT so it needs to read as follows:</p>
  
  <p>Sub-Total:  £332.50
  Delivery Zone 1:    £41.66
  VAT (20%):  £74.83
  Total:  £448.99</p>
  
  <p>Any ideas on how to solve this?</p>