18 Hardware Inc. has a periodic inventory system and uses the weighted average method. The company began the year with 150 large brass switch plates on hand at a cost of $400 each Purchases of switch plates during the year were as follows: Quantity Received 200 Date of Transaction May 7 June 11 November 22 200 250 Unit Cost $1.20 $4.40 $4.80 The switch plates sell for $700 each. If Hardware sells 570 switch plates during the year, what is the company's cost of goods sold