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:

May 30 400 @ $4

June 24 800 @ $5

October 11 900 @ $7

December 4 1,400 @ $6

If the December 31, 20X4 ending inventory is 1,000 units, and the December 31, 20X5 ending inventory is 300 units, what is the 20X5 ending inventory?

$1,200

$1,380

$1,740

$1,800