The following data relate to three independent production periods of Riverside Manufacturing Company. Missing data are indicated by question marks. A B C

Materials:
Beginning inventory $312 $984 $660
Purchases ? 4,200 3,000
Ending inventory 444 600 ?
Total material used 1,980 ? 2,640
Direct labor 3,480 5,760 4,800

Manufacturing overhead:
Indirect material 576 ? 720
Indirect labor 960 900 2,100
Other ? 1,200 2,040
Total manufacturing overhead 3,120 2,880 ?

Work in process inventories:
Beginning ? 540 1,560
Ending 420 ? 600

Finished goods inventories:
Beginning ? 2,400 480
Ending 2,010 720 1,980
Cost of goods manufactured 8,304 ? ?
Cost of goods sold 8,034 13,944 ?

Required:
Using the above data, determine the missing amounts.