(Table: Neighborhood Playground) The willingness to pay for a new neighborhood playground is shown in the table. The marginal cost of providing the playground is MC = 300 + 0.5Q, where Q is square feet. What is the efficient quantity of the good? 
Definitions:
Female Enlisted Personnel
Women who serve as non-commissioned officers or in other ranks within a military organization, excluding officer ranks.
Air Force
A branch of a nation's armed forces that is responsible for conducting aerial warfare and defending the country's airspace.
Regulate Media
The process of governing and overseeing media institutions and content to ensure they meet legal, ethical, and quality standards and do not harm public interest.
Public Opinion
The collective attitudes, beliefs, and reactions of the general public regarding social, political, and economic issues.
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