A firm sells its product to two groups of buyers: daytime buyers and nighttime buyers. There are 50 daytime buyers, all of whom have identical demands given byD_Din the figure below. There are 50 nighttime buyers, all of whom have identical demands given byD_Nin the figure below. The firm's variable costs are constant (SMC=AVC= $12) and its total fixed cost is $250,000. The marketing director must devise a two-part pricing plan that will maximize the firm's profit.

How much profit will the firm earn by charging the optimal access charge and optimal access fee (remember that there are 50 daytime and 50 nighttime buyers)?

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