Consider the following income statement items: Sales Revenue $500,000, Cost of Goods Sold $300,000, Operating Expenses $100,000, Interest Expense $20,000, and Taxes $30,000. Calculate the company's gross profit margin, operating profit margin, and net profit margin.

Requirements:

1. Compute the gross profit margin.
2. Calculate the operating profit margin.
3. Determine the net profit margin.
4. Analyze the company's profitability.
5. Discuss the implications of these margins for the company's financial performance.