Job XXR was unfinished at the end of the accounting period. The total cost assigned to the job is $12,000 of which $3,000 is direct material. Factory overhead is allocated to goods in process at 150% of direct labor cost. What was the amount of direct labor charged to Job XXR? Select one: O a. $3,000 O b. $9,000 O c. $3,600 O d. $4,000