The following data refer to one year. Fill in the blanks.
Direct material inventory, January 1 . . . . . . . . . . . . . . . . . . a.__________
Direct material inventory, December 31 . . . . . . . . . . . . . . . $ 12,300
Work in process inventory, January 1. . . . . . . . . . . . . . . . . 8,100
Work in process inventory, December 31. . . . . . . . . . . . . . 11,400
Finished goods inventory, January 1 . . . . . . . . . . . . . . . . . . 5,700
Finished goods inventory, December 31. . . . . . . . . . . . . . . 900
Purchases of direct materials . . . . . . . . . . . . . . . . . . . . . . . 48,300
Cost of goods manufactured during the year . . . . . . . . . . . 163,350
Total manufacturing costs . . . . . . . . . . . . . . . . . . . . . . . . . . b.__________
Cost of goods sold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168,150
Gross margin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147,750
Direct labor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . c.__________
Direct materials used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43,800
Manufacturing overhead . . . . . . . . . . . . . . . . . . . . . . . . . . . 41,400
Sales revenue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . d.__________