Your favorite group is coming to town for a concert next month. at the door, the cost of one ticket is $30 plus 5% tax. 1. what will it cost for 2 tickets including tax? 2. what will 15 tickets cost, including tax? 3. when you buy advance tickets, you get a 12% discount. what will 15 tickets cost including tax if you buy them advanced? 4. which is the better buy? buying 10 tickets at the door or 12 tickets in advanced?