When WeCo begins operations in 20X4, it chooses the periodic method and LIFO costing. Within a given year's LIFO layer, it uses weighted average costing. During 20X4, WeCo makes the following merchandise purchases: 34. May 30 June 24 October 11 December 4 400 @ $4 800 $5 900@ $7 1,400 @ $6 If the December 31, 20X4 ending inventory is 1,000 units, and the De- cember 31, 20X5 ending inventory is 300 units, what is the 20X5 endir inventory? a. $1,200b. $1,380 c. $1,740 d. $1,800