The following table shows the average total cost, measured as dollars expended per pupil, of operating a high school with the given enrollment. This table is based on a study of economies of scale in high school operations from the 1960s.
Enrollment
170 250 450 650
Average total cost 528 473
425 411
What is the average growth rate of the average cost per additional student enrolled, when moving from an
enrollment of 450 students to an enrollment of 650 students?
The average growth rate per students added is
cents less
expensive