(Table: Security in a Residential Community) The table Security in a Residential Community shows the total cost of hiring a 24-hour security service in a community of 100 residents and each individual resident's total benefit from the service.The marginal cost of hiring the third security guard is ________, and the marginal social benefit is _.
A)$150; $200
B)$450; $1,800
C)$150; $600
D)$450; $600

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The Answer of (Table: Security in a Residential Community) The table Security in a Residential Community shows the total cost of hiring a 24-hour security service in a community of 100 residents and each individual resident's total benefit from the service.The marginal cost of hiring the third security guard is ________, and the marginal social benefit is _.
A)$150; $200
B)$450; $1,800
C)$150; $600
D)$450; $600

(Table: Security in a Residential Community) the Table Security in a Residential