Answer:
Total unitary variable production cost= $40
Step-by-step explanation:
Giving the following information: 
Variable costs per unit: 
Direct materials $24 
Direct labor $14 
Variable manufacturing overhead $2 
The variable costing method incorporates all variable production costs (direct material, direct labor, and variable overhead).
Total unitary variable production cost= 24 + 14 + 2
Total unitary variable production cost= $40