Prepare journal entries to record the following transactions.

1. Purchased $390 of supplies on credit.
2. Completed $590 of work for a client on credit.
3. Paid $390 cash towards the amount owed from transaction a.
4. Completed work for a client and immediately received $890 cash.
5. Collected $590 cash for the work previously performed in transaction b.
6. Received $1,090 cash in advance from a client for services to be performed next period