Rivergum College is planning a community sports day. The event will run from 9:00 am to 2:30 pm. Organisers expect 360 students and 48 staff members. They estimate that 75% of students will attend with one family member, while the remaining students will attend without a guest.
The school will provide water in 15-litre dispensers. Planning guidelines recommend at least 600 mL of drinking water per attendee. A local supplier charges $8.40 per dispenser, including delivery. The canteen budget for fruit is $510. Boxes contain 24 pieces of fruit and cost $32.50 each.
Four activity zones must be supervised throughout the event. Each zone requires two adults at all times. Volunteers work one 90-minute shift, while staff members may work consecutive shifts. The first activity session begins at 9:30 am and the final session ends at 2:00 pm.