A monopolist can sell 20 operating systems at $110 each. In order to sell 21 operating systems, he must reduce the price to $100.

A monopolist can sell 20 operating systems at $110 each. In order to sell 21 operating systems, he must reduce the price to $100. If the monopolist reduces the price to $100, then marginal revenues is

A) -$10

B) -$100

C) $110

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