How much should the entry fee be equal to in the two pricing methods?

The entrance fee is equal to the consumer's surplus.

Two-part pricing method is a pricing method that divides the price into two parts: fixed cost and specific cost. The fixed cost is determined by the average fixed cost calculated by the number of consumers under normal circumstances, and has nothing to do with the number of consumption; Specific charges are determined according to the principle that marginal cost equals marginal utility, which is directly related to consumption.