Compute the return on investment (ROI) for an investment that generated a profit of $50,000 with an initial investment of $200,000.

Calculate the working capital for a company with current assets of $300,000 and current liabilities of $150,000.

Determine the price-earnings (P/E) ratio for a company with a stock price of $50 per share and earnings per share of $5.

Compute the gross profit margin for a company with revenues of $1,000,000 and cost of goods sold of $600,000.

Calculate the debt-to-equity ratio for a company with total debt of $400,000 and total equity of $600,000.