ABC corporation was founded on January 1, 2013. ABC provides telecommunication services. The unadjusted and adjusted trial balances of ABC as of December 2018, are as follows:

Determine the residual value of the equipment, assuming that the useful life of the equipment is 9 years and was acquired the date ABC was founded and the balance in Salaries and wages payable on December 31, 2017, assuming that ABC paid 14,000 in salaries and wages in 2018.

ABC trial balances December 31, 2018 Unadjusted Debit () Credit () 40,000 21,250 6,500 22,000 4,280 12,000 20,000 13,210 3,000 Equipment Accumulated Depreciation-equipment Supplies Accounts receivable Prepaid insurance expenses Cash Share capital Retained earnings Accounts payable Interest payable Notes payable Salaries and wages payable Unearned services revenue Rents payable Service revenue Salaries and wages expense Insurance expenses Interest expenses Depreciation expenses Supplies expense Rent expenses Adjusted Debit () Credit () 40,000 25,500 3,800 25,000 2,630 12,000 20,000 13,210 3,000 230 6,000 2,300 4,500 3,000 33,500 12,300 1,650 910 4,250 5,700 3,000 111,240 111,240 6,000 9,000 26,000 10,000 680 3,000 98,460 98,460