Answer and Explanation:
The preparation of the classified balance sheet is presented below:
                                         Blue Devils Corporation
                                                 Balance Sheet
                                                     Dec 31, 2021
Assets	Amount ($)	Liabilities and shareholder equity	Amount ($)
Current assets:                   Current liabilities  
cash	$3,800                          Accounts payable                $24,800
Accounts receivable $7,800   Salaries payable                 $14,800
Supplies     $17,800
Total current assets $29,400   Total current liabilities        $39,600  
Long-term assets                     Stockholders equity  
Equipment   $108,000            Common stock               $48,000
Accumulated depreciation	-39,000  Retained earnings        $10,800
Total assets	$98,400     Total liabilities and stockholders equity	$98,400
We find the retained earning balance by applying the accounting equation which is shown below:
Assets   = Liabilities + common stock + retained earnings
$98,400 = $39,600 + $48,000  + retained earning
So, the retained earning is $10,800