The Johnson Robot Company’s marketing managers estimate that the demand curve for the company’s robots in 2008 is P = 3,000 - 40Q where P is the price of a robot and Q is the number sold per month.   Derive the marginal revenue curve for the firm and determine the marginal revenue for the 10th unit of output.   a. $2200   b. $2600   c. $40   d. $80

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