Posted by **Anonymous** on Sunday, September 12, 2010 at 10:30pm.

Spider Industries is a U.S.-based company that test-marketed an electronic cobweb destroyer in Japan. The company's revenue, R, is a function of the number of destroyers sold, x, using the following formula R = 160x -0.2x^2.

How many destroyers must the company sell to maximize its revenue?

75, 400, or 40.

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