Answer:
$18,200
Step-by-step explanation:
Retained earnings. $2,520
Add: Service revenue $21,920
$24,440
Less : Expenses
Wages expenses (3,200)
Supplies expense (1,120)
Depreciation exp. (960)
Total expenses. (5,280)
Net income 19,160
Less dividends. (960)
Retained earnings 18,200
Retained earnings at 31 December is $18,200