monte vista uses the perpetual inventory system. at the beginning of the quarter monte vista has $35,000 in inventory. during the quarter the company purchase $8,650 of new inventory from a vendor return $1,200 of inventory to the vendor and took advantage of discounts from the vendor of $250. at the end of the quarter the balance in inventory is $29,000. what is the cost of goods sold? a)$6,000 b)$13,200 c)$15,150 d)$14,650