Use the following to answer questions: 
-(Table: Total Cost and Output) Look at the table Total Cost and Output, which describes Sergei's total costs for his perfectly competitive all-natural ice cream firm. If the market price of a tub of ice cream is $67.50, how much is Sergei's total revenue at the profit-maximizing output?
Definitions:
Major Function
The primary role or purpose that something serves or is designed to perform.
Stomata
Tiny openings or pores in plant tissue that allow for gas exchange, including the intake of carbon dioxide and release of oxygen.
Membrane Permeability
The ability of a membrane to allow substances to pass through it, which can be regulated to maintain cellular homeostasis.
Acid Precipitation
Precipitation that is acidic as a result of both sulfur and nitrogen oxides forming acids when they react with water in the atmosphere.
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