The Atkinson Corp. uses a job cost system and a predetermined overhead rate based on labor cost. The following T-account summarizes January 1998 activity relating to work in process:

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Work in Process Inventory 1/1/98 Balance 30,000 Materials used 50,000 Labor cost 60,000 Overhead applied 40,000 1/31/98 Balance 60,000 1/31/98 Jobs completed 120,000 Required: If jobs in the work in process inventory on 1/31/98 contain $10,000 of materials, how much labor cost is in the work in process inventory on 1/31/98?