Answer:
The accounting entry for each transaction is given below.
Gibson contributed $10,000 to the business in exchange for capital.
Debit Cash Asset    $10,000
Credit Capital        $10,000
b. Purchased equipment for $5,000 on account.
Debit equipment Asset    $5,000
Credit Payable Liability    $5,000
c. Paid $400 for office supplies.
Debit payable     $400
Credit Cash Asset  $400
d. Earned and received $2,500 cash for service revenue.
Debit Cash Asset   $2,500
Credit Income      $2,500
e. Paid $400 for wages to employees.
Debit Wages expense  $400
Credit Cash Asset      $400
f. Gibson withdrew $1,000 cash
Debit Capital      $1,000
Credit Cash Asset  $1,000
.g. Earned $1,000 for services provided. Customer has not yet paid.
Debit Receivable      $1,000
Credit Service Income  $1,000
h. Paid $1,000 for rent.
Debit Rent expense  $1,000
Credit Cash Asset    $1,000
i. Received a bill for $250 for the monthly utilities. The bill has not yet been paid.
Debit Utility expense   $250
Credit payable         $250