Thread: Trying to add a tax figure of 13% againts my packages viewable to client

Trying to add a tax figure of 13% againts my packages viewable to client

I am trying to add a tax figure of 13% ontop of the ad package price per ad package and i want it viewable on the confirm page to the user so they know there getting charged an extra $2.60 for tax and the final figure to go to paypal such as $19.99 + $2.60 = $22.59. Please Help! URGENT need site up and running asap