Broomfield city council is deciding how many police officers the city needs. Broomfield's population is 10,000 people. The marginal cost of a police officer is $60,000 per year. The marginal benefit schedule of an average city resident from police protection is shown in the table above. Police Protection is a public good. To support the efficient number of police officers, each resident of broomfield will have to pay ___ per year in taxes.

A) $36

B) 18

C) 6.40

D) 60

graph is described below

Number of police officers....... Marginal benefit (dollars from the last officer)

1 8.00

2 7.20

3 6.40

4 5.60

5 4.80

6 4.00

7 3.20