Answer:
Part 1.
Part 2.
Explanation:
The total cost is the admission charge ($60) plust the cost of the pass ($100 or $130).
For a two-day pass that is: $60 + $100 = $160, per person
For a three-day pass that is: $60 + $130 = $190, per person
Part 1. The average cost per day of a three-day pass per person.
The average cost is the total cost divided by the number of days.
The marginal cost of adding the third day per person is found by subtracting the total cost for two days from the total cost for three days:
This says that althoud the average cost for the three days is $53.33 the cost of adding the third day is $30, which is much lower; thus, it is a good deal to buy a three-days pass, as they are interested in spending a lot of time there.
Part 2. The group's marginal cost of switching from the two-day pass to the three-day pass
Since the marginal cost of switching from the two-day pass to the three-day pass is $30 per person, the marginal cost for the 6-person group is 6 times $30: