Accounts of Pioneer Heating Corporation at the end of the first year of operations showed the following balances. In addition, prepaid operating expenses are 4000, and accrued sales commissions payable are $5900. Investment revenue receivable is $1000. Depreciation for the year on buildings is $4500 and on machinery, $5000. Federal and state income taxes for the year are estimated at $18100. Debit Credit Cash $39000 Inventory $50000 Investment $50000 Land $70000 Buildings $180000 Machinery $100000 Accounts payable $65000 Common Stock $320000 Additional paid-in capital $40000 Sales $590000 Cost of goods Sold $230000 Sales Commissions $200000 General Operating Expenses $101000 Investment Revenue $5000 Totals $1020000 $1020000 1 Prepare the necessary entries to adjust and close the books. 2 Prepare a post-closing trial balance.