I just started my planning. I'm between two venues, one that charges a 20% service fee, and one that doesn't. I'm trying to figure out what the difference in price would be between both sites, but I don't know when to add the service fee. Do I add the price per person, site fee, ceremony fee, valet fees, and THEN service fee and tax? Or do I figure out the price per person and service fee, then add the site fee/ceremony fee/valet fee/tax after?