on saturday, december 31, the company's owner provided ten hours of service to a customer. the company bills $100 per hour for services provided on weekends. payment has not yet been received. the owner did not stop in the office on saturday; as such, on december 31, the services were unbilled and unrecorded. complete the necessary december 31 journal entry by selecting the account names from the pull-down menus and entering dollar amounts in the debit and credit columns.