When WeCo begins operations in 2014, it chooses the periodic method and LIFO costing. within a given year's LIFO layer, it uses weighted average costing. During 2014, WeCo makes the following merchandise purchases : May 30 400 units at $4; June 24 800 units at $5; October 11 900 units at $7; December 4 1,400 at $6 . If the December 31,2014 ending inventory is 1,000 units, and the December 31 2015 ending inventory is 300 units, what is the 2015 ending inventory?