A monopolist can sell 20 units a week at a price of $10 per unit. To sell 21 units a week, it would have to lower its price to $9 per unit. The marginal revenue of the 21^st unit would be: A)$9. B)−$11. C)−$12. D)−$20. E)$11.

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The Answer of A monopolist can sell 20 units a week at a price of $10 per unit. To sell 21 units a week, it would have to lower its price to $9 per unit. The marginal revenue of the 21^st unit would be: A)$9. B)−$11. C)−$12. D)−$20. E)$11.

A Monopolist Can Sell 20 Units a Week at a Price