A campsite charges a flat fee per vehicle and a price per camper for each evening. The table shows the number of campers, 2, at a local campsite and the total amount of money, y, in dollars, earned by the campsite.
Number of Campers, x
24

35
41
27
Total Amount, y
$96
$140
$164
$108
Which best represents the units for the rate of change in the table?
campers
campers per dollar
dollars
dollars per camper