need help with the last part. im confused

Required information [The following information applies to the questions displayed below.] A company reports the following beginning inventory and two purchases for the month of January. On January 26 , the company sells 400 units. Ending inventory at January 31 totals 150 units. equired: ssume the perpetual inventory system is used. Determine the costs assigned to ending inventory when costs are assigned based e FIFO method