单项选择题

Suppose that a price of $30 per month, there are 30,000 subscribers to cable television in

Small Town. If Small Town Cablevision raises its price to $40 per month, the number of subscribers will fall to 20,000. Suppose that a price of $30 per month, there are 30,000 subscribers to cable television in Small Town. If Small Town Cablevision raises its price to $40 per month, the number of subscribers will fall to 20,000. At which of the following prices does Small Town Cablevision earn the greatest total revenue?A.either$30or$40permonthbecausethepriceelasticityofdemandis1.0.B.$30permonth.C.$40permonth.D.$0permonth.