Part 5: Optional work sheet Enter the unadjusted trial balance on a 10-column end of period spreadsheet (work sheet), and complete the spreadshe et using the following adjustment data. 13,600 f. The adjustment for customer returns and allowances is $60,000 for sales and $35,000 for cost of goods sold. If an amount box does not require an entry, leave it blank. Part 5: Optional work sheet Enter the unadjusted trial balance on a 10-column end of period spreadsheet (work sheet), and complete the spreadshe et using the following adjustment data. 13,600 f. The adjustment for customer returns and allowances is $60,000 for sales and $35,000 for cost of goods sold. If an amount box does not require an entry, leave it blank