-The table above shows the marginal benefit from providing police protection in a community of two people, Jake and Elwood. Police protection is a public good.
a) What is the marginal social benefit to community from the 4th police car on duty?
b) If the marginal social cost of a police car on duty is $37, what is the efficient number of cars on duty?
c) If the marginal social cost of a police car on duty is $70, what is the efficient number of cars on duty?

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The Answer of 
-The table above shows the marginal benefit from providing police protection in a community of two people, Jake and Elwood. Police protection is a public good.
a) What is the marginal social benefit to community from the 4th police car on duty?
b) If the marginal social cost of a police car on duty is $37, what is the efficient number of cars on duty?
c) If the marginal social cost of a police car on duty is $70, what is the efficient number of cars on duty?

-The Table Above Shows the Marginal Benefit from Providing Police