Profit is calculated as total revenue (TR) minus total cost (TC).
For quantity 1, profit is $10 - $4 = $6.
For quantity 2, profit is $18 - $8 = $10.
For quantity 3, profit is $24 - $12 = $12.
For quantity 4, profit is $28 - $16 = $12.
For quantity 5, profit is
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