The following transactions have been journalized and posted to the proper accounts. March is the first month of business operations for the sole proprietorship. Mar. 1 The business received $ 9 comma 000 cash from the owner in exchange for capital. Mar. 2 Paid the first month's rent of $ 500. Mar. 3 Purchased equipment by paying $ 2 comma 000 cash and executing a note payable for $ 6 comma 000. Mar. 4 Purchased office supplies for $ 600 cash. Mar. 5 Billed a client for $ 11 comma 000 of design services completed. Mar. 6 Received $ 6 comma 000 on account for the services previously recorded. What is the ending balance in the Service Revenue account?