The GA-15508 company uses direct labor cost as its allocation base for its predetermined overhead rate. The company reports $ 2,400 for the ending balance of its work in process Inventory. The company has two incomplete products that respectively used $ 300 and $ 200 of direct materials, and $ 600 and $ 400 of direct labor. Using these facts, what is the GA-15508 company's predetermined overhead rate as a percentage of direct labor cost?