During the current period, Department A finished and transferred 50,000 units to Department B. Of the 50,000 units, 20,000 were one-fifth complete at the beginning of the period and 30,000 were started and completed during the period. Also during the period, 10,000 units were started but brought only to a stage of being three-fifths completed. If the FIFO method is used and $13,000 of overhead was charged to Department A during the period, how much overhead should be allocated to the ending goods in process inventory?