Cullumber Inc.'s general ledger at April 30, 2018, included the following: Cash $5,500; Supplies $500; Equipment $24,000; Accounts Payable $2,000; Unearned Revenue (from gift certificates) $1,100; Bank Loan Payable $9,800; Common Shares $5,300; and Retained Earnings $11,800. The following transactions occurred during May:

May

1

Paid rent for the month of May, $1,100.

4

Paid $1,100 of the account payable outstanding at April 30.

7

Issued gift certificates for future services for $1,400 cash.

15

Received $1,800 from customers for services performed to date.

15

Paid $1,200 in salaries to employees.

17

Customers receiving services worth $800 used gift certificates in payment.

18

Paid the remaining accounts payable from April 30.

22

Purchased supplies of $800 on account.

24

Received a bill for advertising for $500. This bill is due on June 22.

25

Received and paid a utilities bill for $400.

28

Received $1,900 from customers for services performed.

29

Customers receiving services worth $600 used gift certificates in payment.

30

Interest of $50 was paid on the bank loan.

31

Paid $1,200 in salaries to employees.

31

Paid income tax instalment for the month, $150.