13. During Dece During December our company sold 900 units of prodyt Y. Its beginning inventory and purchases cand purchases during the month were as follows: December 1 December 5 December 10 December 15 December 20 December 20 Beginning Inventory Purchases Purchases Purchases Purchases Purchases Units 200 200 200 200 200 Cost $1.00 $2.00 $3.00 $4.00 $5.00 $6.00 200 Calculate the value of the ending inventory under each of three methods: Average Cost (b) LIFO (c) FIFO