This table shows the total costs for various levels of output for a firm operating in a perfectly competitive market. 
According to the table shown,what is the firm's total revenue when 4 units are produced?
Definitions:
Berkowitz's Theory
A psychological theory suggesting that frustration leads to aggression, and the presence of aggressive cues directs this frustration towards aggression.
Frustration
A negative emotional state resulting from blocked or unmet needs, goals, or desires.
Pain
A distressing sensation and emotional experience linked to actual or potential tissue damage.
Unpleasant Events
Events or occurrences that cause discomfort, distress, or unhappiness to an individual or group.
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