The financial information for General Electric's Aviation Division for the fiscal year ending December 31, Year 21 is as follows:

Income Statement:

• Sales revenue: $8,000,000
• Cost of goods sold: $5,000,000
• Gross profit: $3,000,000
• Operating expenses: $1,200,000
• Depreciation: $500,000
• Operating income: $1,300,000
• Interest expense: $200,000
• Gain on sale of assets: $100,000
• Net income: $1,200,000

Balance Sheet:

• Cash: $600,000
• Accounts receivable: $800,000
• Inventory: $1,200,000
• Property, plant, and equipment (net): $1,800,000
• Total assets: $4,400,000
• Accounts payable: $600,000
• Long-term debt: $800,000
• Stockholders' equity: $3,000,000
• Total liabilities and equity: $4,400,000

Requirements:

1. Compute the ROI for General Electric's Aviation Division.
2. Analyze the gross profit margin.
3. Determine the impact of the gain on sale of assets on net income.
4. Calculate the quick ratio.

Discuss the significance of operating income in relation to total revenue.