Prepare a trial balance at July 31 on a worksheet. Enter the following adjustments on the worksheet and complete the worksheet. (1) Unbilled and uncollected revenue for services performed at July 31 were $2,800. (2) Depreciation on equipment for the month was $500. (3) One-twelfth of the insurance expired. (4) An inventory count shows $500 of cleaning supplies on hand at July 31. (5) Accrued but unpaid employee salaries were $1,070.