To figure out how much to budget, Mr. Williams will need to determine how many people (students and adults) are going on the trip.
If there are 171 7th graders, there will need to be 38 adults (2 adults per 9 students is 38 adults for 171 students.
This is a total of 209 people(171 students and 38 adults).
$6 per person x 209 people = $1254 for food
$4.50 x 171 + $7.25 x 38 = $1045 Cost for tickets to the museum
0.04(4%) x 1045 = $41.80 for parking
For the museum tickets and parking Mr. Williams will need to budget $1045 + $41.80 = $1086.80 for parking and tickets.
If you are including the food cost you would need to add $1254 to this.