Answer:
Under the periodic system the cost of goods sold is not recorded.
This is a perpetual inventory system.
Account Titles and Explanation Debit Credit
1 Merchandise Inventory $ 5590
Cost of goods Sold $ 5590
Excess of ending inventory ( 18070-12840=) $5590 adjusting entry
2 Sales $123,390
Income Summary $ 123,390
Closing entry
3 Income Summary $96490
Sales Discounts $ 1030
Sales Return and Allowances $ 1930
Cost of Goods Sold $ 60,870
Operating Expenses $ 32,660
Closing entry