Calculate the price-to-earnings (P/E) ratio for Company JJJ, which has a current stock price of $50 per share and earnings per share (EPS) of $5. Describe the price-to-earnings (P/E) ratio as a measure of a company's valuation, indicating the relationship between its stock price and earnings per share. Discuss the significance of the P/E ratio in assessing a company's investment attractiveness and growth prospects.