rooms for tonight. If the marginal cost of operating one room for one night is $40, the hotel manager should rent one of the empty rooms only if a customer is willing to payA．more than ＄40, as the average benefit will exceed the marginal cost．B．more than ＄40, as the marginal benefit will exceed the marginal cost．C．more than ＄80, as the average benefit will exceed the marginal cost．D．more than ＄80, as the marginal benefit will exceed the marginal cost．