Answer:
d.
Explanation:
The total cost of the first gym for 4 classes based on the given graph is $120. That is, when number of classes (n) = 4, total cost (C) = 120.
We are told that the second gym has the same total cost (C) = when number of classes (n) = 4.
Thus, from the options given, the only scenario that represents the second gym is when membership fee/initial value = $40 and the charge per class, = $20.
For 4 classes we would have the following total cost:
$40 + 4($20)
= $40 + $80
Total cost = $120