Provide Journal Entries for the following situations
1. Performed service for client and received cash of $900
2. Paid off the beginning balance of accounts payable - $8,000.
3. Purchased office supplies on account, $600.
4. Collect cash from a customer on account, $2,300
5. Billed a client for consulting services on account, $5,500
6. Paid office rent for the month, $1,200.