After completing the closing entries for Revenues and Expenses, the Income Summary account has a credit balance of $$1,500.$

The journal entry to close out the $$1,500$ credit balance of Income Summary would be:

$\backslash$table$[[$Date$,$Accounts,Debit,Credit$],[,$Service Revenue,$1,500,],[,$Income Summary,,$1,500]]$

$\backslash$table$[[$Date$,$Accounts,Debit,Credit$],[,$Income Summary,$1,500,],[,$Service Revenue,,$1,500]]$

$\backslash$table$[[$Date$,$Accounts,Debit,Credit$],[,$Income Summary,$1,500,],[,$Retained Earnings,,$1,500]]$

$\backslash$table$[[$Date$,$Accounts,Debit,Credit$],[,$Retained Earnings,$1,500,],[,$Income Summary,,$1,500]]$