Given the following data, what is the cost of goods sold? Sales $990 Raw materials inventory, beginning $40 Raw materials inventory, ending $70 Direct labour Purchases of raw materials Manufacturing overhead Administrative expenses Selling expenses $120 $200 $230 $150 $140 Work in process inventory, beginning $70 Work in process inventory, ending $50 Finished goods inventory, beginning $120 Finished goods inventory, ending $160 a. $700. b. $580. c. $500 d. $660