A small business has the following information for the month of January:

• Total revenue: $30,000
• Total cost of goods sold (COGS): $15,000
• Total operating expenses: $8,000
• Interest expense: $1,000
• Depreciation expense: $2,000

Calculate the following:

• Gross profit
• Operating profit
• Net profit
• Gross profit margin
• Operating profit margin
• Net profit margin