Answer:
$6.25 per person.
Step-by-step explanation:
This can be calculated as follows:
Expected number of people = 100
Expected number of people that would free ride = 20
Number of expected people to pay = Expected number of people - Expected number of people that would free ride = 100 - 20 = 80
Cost to charge per person = Total cost / Number of expected people to pay = $500 / 80 = $6.25 per person.
Therefore, city officials should charge $6.25 per person for the concert series in order to cover the $500 expense.