The following information relates to Juniper Companys operations during May: May 1 May 31 Direct materials inventory $15,000 $22,000 Work in process inventory 12,000 10,000 Finished goods inventory 16,000 25,000 Additional information for the month is as follows: Direct materials used. $28,000 Direct materials purchased 35,000 Direct labor costs 17,000 Manufacturing overhead incurred 12,000 Sales revenue 95,000 The cost of goods sold was equal to: a. $59,000 b. $57,000 c. $66,000 d. $50,000