St. Clair's pre-school creates a budget based on 6 classrooms with an average class size of 15 students each. There are no per student variable costs as most costs are spread across all students in a classroom (for example, the teacher). The Head Teacher set the tuition at $590 per month for 8 months. For the first semester (Sep, Oct, Nov, Dec), the school had 14 students per class, but they added 12 new students to the school in for the second semester thanks to a special promotional plan. St. Clair's had budgeted $2000 for marketing, all of which historically was spent prior to the start of the school year, and this year they actually spent $1,300 in June. In November, however, when they decided to run the special promotion of 1 free month of tuition for January enrollment for the 2nd 4 month semester (Jan, Feb, Mar, Apr). In addition, they spent another $1500 for advertising this promotion.

What was St. Clair's budgeted volume in planned months of student tuition?