Answer:
Income summary has a $208,630 credit balance before being closed
Explanation:
The closing entries should be:
Dr Service revenue 257,000
  Cr Income summary 257,000
Dr Income summary 48,370
  Cr Rent expense 10,700
  Cr Utility expense 4,200
  Cr Salary expense 19,200
  Cr Depreciation expense 9,700
  Cr Advertising expense 4,570
Income summary
Debit        Credit
18,370 Â Â Â Â Â Â 257,000
            208,630
In order to close income summary:
Dr Income summary 208,630
  Cr Retained earnings 208,630
If you want to close dividends:
Dr Retained earnings 18,700
  Cr Dividends 18,700