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)-$21

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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)-$21

A Monopolist Can Sell 20 Units a Week at a Price