Analyze the financial performance of Parisian Fashion House using the following information:

• Net Sales: €2,000,000
• Cost of Goods Sold: €800,000
• Operating Expenses: €500,000
• Interest Expense: €30,000
• Income Tax Expense: €150,000
• Average Total Assets: €3,000,000
• Average Total Equity: €1,200,000

Calculate the following financial ratios: gross profit margin, operating profit margin, return on assets (ROA), return on equity (ROE), debt-to-equity ratio, and interest coverage ratio.

Interpret the results of the financial ratios and provide recommendations for Parisian Fashion House's financial management.