Final answer:
Kalteen's profit is calculated by subtracting the total cost from the total revenue. The total cost is $1000, and the total revenue is $3000, so the profit is $2000.
Step-by-step explanation:
The student has inquired about the profit for a firm named Kalteen that has sold 250 units at $12 each. To calculate profit, we need to subtract the total cost from total revenue. With an average total cost of $4 per unit, the total cost for 250 units would be $4 multiplied by 250, which is $1000. The total revenue from selling 250 units at $12 each is $12 multiplied by 250, resulting in $3000. Thus, the firm's profit is total revenue ($3000) minus total cost ($1000), which equals $2000.