The officers of a high school senior class are planning to rent buses and vans for a class trip. each bus can transport 6363 students, requires 88 chaperones, and costs $ 1,200 to rent. each van can transport 77 students, requires 1 chaperone, and costs $80 to rent. since there are 567 students in the senior class that may be eligible to go on the trip, the officers must plan to accommodate at least 567 students. since only 80 parents have volunteered to serve as chaperones, the officers must plan to use at most 80 chaperones. how many vehicles of each type should the officers rent in order to minimize the transportation costs? what are the minimal transportation costs?