Answer:
Step-by-step explanation:
The closing entry for the following accounts are shown below: 
1. Sales Revenue A/c Dr $528,000
 Interest revenue A/c Dr $7,200 
 Gain on sale of investments Dr $9,800 
 To Income Summary $545,000
(Being revenue account closed) 
2. Income summary A/c Dr $479,500
 To Salaries Expense $87,800
 To Advertising Expense $12,000
 To Cost of goods sold $290,400 
 To Insurance expense $15,200
 To Interest expense $4,100
 To Income tax expense $44,000
 To Depreciation expense 26,000
(Being expenses accounts are closed) 
3. Income summary A/c Dr $65,500
 To Retained earning $65,500
(Being the difference is credited to retained earning)