Help me plz

Obj. 2, 3 EX 2-9 Transactions and T accounts The following selected transactions were completed during March of the current year: 1. Billed customers for fees earned, $54,100 2. Purchased supplies on account, $1,250 3. Received cash from customers on account, $43,800. 4. Paid creditors on account, $600. A. Journalize these transactions in a two-column journal, using the appropriate number to identify the transactions. Journal entry explanations may be omitted. B. Post the entries prepared in (A) to the following T accounts: Cash, Supplies, Accounts Receivable, Accounts Payable, Fees Earned. To the left of each amount posted in the accounts, place the appropriate number to identify the transaction. c.- Assume that the unadjusted trial balance on March 31 shows a credit balance for Accounts Receivable. Does this credit balance mean an error has occurred