Solve the Problem $x$ Radios Is $c ( x ) = 400 + 20 x - 0.2 x ^ { 2 }$

question 183

Multiple Choice

Solve the problem.
-Suppose that the dollar cost of producing $x$ radios is $c ( x ) = 400 + 20 x - 0.2 x ^ { 2 }$ . Find the marginal cost when 40 radios are produced.

• A) $36
• B) $880
• C) -$880
• D) $4

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