Department J had no work in process at the beginning of the period, 18,000 units were completed during the period, 2,000 units were 30% completed at the end of the period, and the following manufacturing costs were debited to the departmental work in process account during the period (Assuming the company uses FIFO and rounds average cost per unit to two decimal place): Direct materials (20,000 at $5) $100,000 Direct labor 142,300 Factory overhead 57,200 Assuming that all direct materials are placed in process at the beginning of production, what is the total cost of the departmental work in process inventory at the end of the period? a. $16,438 b. $90,000 c. $199,500 d. $283,140 (I want to know how to work it out not just the answer.)