Help with SE 5-8. What part do you need to make it complete

SE5-7. Gross Profit Percentage Using the data below, compute Dino's gross profit month of January $10,000 Cost of goods sold.... Operating expenses.. 4,000 3,000 1,200 Income tax expense. . SE5-8. Return on Sales Ratio Using the data in SE5-9, compute Dino's return on sales ratio for the month of January SE5-9. Cost of Goods Sold and the Periodic System Kanzu Company uses the periodic inventory system. Kanzu started the period with $10,000 in inventory. The Company purchased an additional $25,000 of merchandise, and returned S1,000 for a full credit. A physical count of inventory at the end of the pe riod revealed that there was an ending inventory balance of $8,000. What was Kanzu's cost of goods sold during the period