I was confused on how to close the entries for revenue and supplies expense and how would I put it in retained earnings? Is every else correct?

Required Information [The following information applies to the questions displayed below Sye Chase started and operated a small family architectural firm in Year 1. The firm was affected by two events: (1) Chase provided $20,400 of services on account, and (2) he purchased $5,100 of supplies on account. There were $800 of supplies on hand as of December 31, Year 1 Required a. b. & e. Record the two transactions in the accounts. Record the required year-end adjusting entry to reflect the use of supplies and the required closing entries. Post the entries in the T-accounts and prepare a post-closing trial balance. (Select "a1, a2, or b" for the transactions in the order they take place. Select "cl" for closing entries. If no entry is required for a transactlon/event, select "No Journal entry required" in the first account field.) Accounts Receivable Supplies Beg. Bal 0 Beg. Bal. 0 0 a1 a2. 20.400 5,100 4,300 a2. End. Bal. End. Bal 20,400 800 Retained Earnings Accounts Payable Beg. Bal. Beg. Bal. 0 0 0 5.100 a2 End. Bal. End. Bal 5,100 Service Revenue Supplies Expense Beg. Bal. Beg. Bal. 0 0 20.400 a1 4,300 20,400 End. Bal. 4,300 End. Bal