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 by DD in the figure below.There are 50 nighttime buyers,all of whom have identical demands given by DN in 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. 
Assuming both daytime and nighttime markets are served,the optimal per unit usage fee (f*) is
Definitions:
Car-buying
The process of acquiring a vehicle, typically involving negotiation, financial transactions, and decision-making.
Negotiation
A dialogue between two or more parties intended to reach a beneficial outcome over a conflict, through compromise or agreement.
Internet Age
A period in human history characterized by the widespread adoption and use of the internet, impacting communication, commerce, and information access.
Relational Definition
A way of explaining something based on its relationships or connections to other things rather than its inherent qualities.
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