Other data: 1. the balance in prepaid insurance is a one-year premium paid on june 1, 2017. 2. an inventory count on august 31 shows $478 of supplies on hand. 3. annual depreciation rates are (a) buildings (4%) (b) equipment (10%). salvage value is estimated to be 10% of cost. 4. unearned rent revenue of $4,019 was earned prior to august 31. 5. salaries of $356 were unpaid at august 31. 6. rentals of $743 were due from tenants at august 31. (use accounts receivable account.) 7. the mortgage interest rate is 8% per year.