I need to know what I did wrong here!

Thanks.

Question 1 Kingbird, Inc.'s general ledger at April 30, 2017, included the following: Cash $6,000, Supplies $600 Equipment $28,800, Accounts Payable $2,520, Notes Payable $12,000, Unearned Service Revenue (from gift certificates) $1,200, Common Stock $6,000, and Retained Earnings $13,680. The following events and transactions occurred during May May 1 Paid rent for the month of May $1,200 4 Paid $1,320 of the account payable at April 30 7 Issued gift certificates for future services for $1,800 cash 8 Received $1,440 cash from customers for services performed 14 Paid $1,440 in salaries to employees. 15 Received $960 in cash from customers for services performed 15 Customers receiving services worth $840 used gift certificates in payment. 21 Paid the remaining accounts payable from April 30 22 Received $1,200 in cash from customers for services performed 22 Purchased supplies of $840 on account. All of these were used during the month. 25 Received a bill for advertising for $600. This bill is due on June 13 25 Received and paid a utilities bill for $480 29 Received $2,040 in cash from customers for services performed 29 Customers receiving services worth $720 used gift certificates in payment. 31 Interest of $60 was paid on the note payable 31 Paid $1,440 in salaries to employees. 31 Paid income tax payment for the month $180 Using T-accounts, enter the beginning balances in the general ledger as of April 30, 2017 Cash Apr. 30 6000 Supplies Apr. 30 600 Equipment Apr. 30 28800 Accounts Payable Apr. 30 2520 Notes Payable