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a. As of December 31 , Gullo had performed $900 of service revenue but has not yet billed customers. b. At the end of the month, Gullo had $400 of office supplies remaining. c. Prepaid Insurance of $4,950 remained. d. Depreciation expense, $3,700. e. Accrued salaries expense of $350 that hasn't been paid yet. Requirement 2. Journalize the adjusting entries. (Record debits first, then credits. Select the explanation on the last li a. As of December 31 , Gullo had performed $900 of service revenue but has not yet billed customers. Review the worksheet. b. At the end of the month, Gullo had $400 of office supplies remaining. Review the worksheet