SeCo begins operations in 20316 and uses the periodic method and weightedaverage costing. SeCo has the following merchandise purchases during 203%: ?00 units in March @ $4; $1,100 units in July @ $6; and 2,200 units in October @ $1 A physical count of ending inventory nds 1,000 units. Calculate the cost of goods sold. $6,200 $?,000 $18,600 $24,000