I would like to purchase the Fredo6 Bundle that includes Curviloft for my classroom. I can purchase 30 seats for $100. My question is regarding how the extensions will be counted. I have 26 workstations. In a given day, three different students work at each workstation. So each workstation has three different user accounts. Do I need one set of 30 seats for $100 or will I need to purchase 90 seats for $300?