13. Troy Company uses a job order cost system. The following debits (credits) appeared in the Work in Process account for the month of June.

June 1, Balance $12,000

June 30, Direct Materials $50,000

During the month of June, direct labor totaled $30,000 and $18,000 of overhead was applied to production. Finished goods was debited $100,000 during June. Troy applies overhead at a predetermined rate of 60% of direct labor cost. Job number 83, the only job in process at the end of June, has been charged with manufacturing overhead of $3,600. What is the amount of direct materials charged to job number 83?