Final answer:
The variable cost of producing 240 units of output is $1200.
Step-by-step explanation:
To calculate the variable cost of producing 240 units of output, we need to determine the total cost of labor. For each unit of labor, the cost is $5. Therefore, the total cost of labor for 240 units is $5 * 240 = $1200.
The variable cost of producing 240 units is equal to the cost of labor, which is $1200.