The Xu Corporation uses a periodic inventory system. The company has a beginning inventory of 300 units at $5 each on January 16 purchases 500 units at $4 each in February and 200 units at $6 each in March. There were no additional purchases or sales during the remainder of the quarter. Xu sells 150 units during the quarter. If Xu uses the weighted average method, what is its cost of goods sold for the first quarter? $750 $600 O $705 O $900