To solve: add up all in the labor costs and then divide by the number of units produced to get the per unit cost of the labor.
Direct materials = $4,400
Direct labor = $5,600
Factory overhead = $2,400
Units produced = 1,000
Per unit cost = ($4,400 + $5,600 + $2,400)/1,000
Per unit cost = $12,400/1,000
Per unit cost = $12.40