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 1 inventory $28 $840 Purchases: October 5 100 30 3,000 October 13 60 32 1,920 October 15 20 36 3,240 Goods Available for Sale 280 $9,000 Sales: October 8 110 October 22 120 230 Using weighted average cost under a perpetual inventory system, what is the amount of Cost of Goods Sold (round intermediate and final calculations to the nearest dollar) recorded on October 8? $3,900 $3,300 $3,410 $4,030