please do it in 15 minutes please urgently.. I'll give you up thumb definitely

The activity for a specific inventory item for the month of March was as follows: # of Per Unit Total Units Cost Cost October I inventory 30 S28 $840 Purchases: October 5 100 30 3.000 October 13 60 32 1.920 October 15 90 36 3.240 Goods Available for Sale 280 $9,000 Sales: October 8 110 October 22 120 230 Using first-in, first-out (FIFO) under a periodic inventory system, what is the balance of Cost of Goods Sold for month ended October 31? Assuming physical count indicates that the ending balance of Inventory is S1.680. $7,300 O $7,320 $7,280 $7,360