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A monopolistic firm has a sales schedule such that it can sell 10 prefabricated garages per week at $10,000 each, but if it restricts its output to 9 per week it can sell these at $11,000 each. The marginal revenue of the tenth unit of sales per week is:A. -$1,000.

B. $9,000.

C. $10,000.

D. $1,000.