The following transactions for the month of March have been journalized and posted to the proper accounts. Mar. 1 Martinez invested $9,000 cash in his new design services business.
Mar. 2 Paid the first month's rent of $800.
Mar. 3 Purchased equipment by paying $3,000 cash and executing a note payable for $5,000.
Mar. 4 Purchased office supplies for $750 cash.
Mar. 5 Billed a client for $10,000 of design services completed.
Mar. 6 Received $8,000 on account for the services previously recorded.

What is the ending balance in the Service Revenue account?

a. $19,000
b. $9,000
c. $10,000
d. $8,000