Answer:
Direct material= $5,600
Explanation:
First, we need to calculate the direct labor added to Work in Process:
Direct labor= allocated overhead / predetermined overhead rate
Direct labor= 6,400 / 0.8
Direct labor= $8,000
Now, by difference, the direct materials:
Direct material= Ending balance - allocated overhead - direct labor
Direct material= 20,000 - 6,400 - 8,000
Direct material= $5,600