Maple Inc. applies overhead to production at a predetermined rate of 80% based on direct labor cost. Job No. 550, the only job still in process at the end of October, has been charged with manufacturing overhead of $4,000. What was the amount of direct materials charged to Job 550 assuming the balance in Work in Process inventory is $14,000? ch$3,200 O $6,000 O $5.000 O Cannot be determined