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Suppose that a competitive​ firm's marginal cost of producing output q​ (MC) is given by MC (q )equals6plus2 q. Assume that the market price​ (P) of the​ firm's product is ​$18 . What level of output​ (q) will the firm​ produce? The firm will produce nothing units of output. ​(Enter your response rounded to two decimal places.​)