15. A hotel rents rooms to customers by the night. The hotel determines that if it sets the price of the room to be ​$140 per​ night, 140 rooms will be rented. In order to rent 190 ​rooms, it must lower the price to ​$90 per night. If the hotel sets the price to be​ $110 per​ night, what is the marginal​ revenue?   The marginal revenue is ​$enter your response here   per room.

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