Final answer:
The company's P/E ratio is 9.
Step-by-step explanation:
The price-to-earnings ratio (P/E ratio) is a financial metric that compares a company's stock price with its earnings per share. It is calculated by dividing the stock price by the earnings per share. In this case, the stock price is $45 per share and the earnings per share is $5, so the P/E ratio would be 9 ($45 / $5 = 9).