On March 31, 2021, Waterway Rental Agency Inc's trial balance included the following selected unadjusted account balances. The company's year end is December 31 and it adjusts its accounts quarterly. Debit Credit Prepaid insurance $14,700 Supplies 2,800 Equipment 22,400 Accumulated depreciation-equipment $5,800 Deferred revenue 9,990 Loan payable, due 2023 19,800 Rent income 27,100 Salaries expense 14,100 An analysis of the accounts shows the following: 1. The equipment, which was purchased on January 1, 2020, is estimated to have a useful life of four years. The company uses straight-line depreciation. 2. One third of the deferred revenue related to rent is still unearned at the end of the quarter. 3. The bank loan payable has an interest rate of 6%. Interest is paid on the first day of each following month and was last paid March 1, 2021. 4. Supplies on hand total $900 at March 31. 5. The one-year insurance policy was purchased for $14,700 on January 1. 6. Income tax is estimated to be $3,010 for the quarter.