The income statement of Holly Enterprises shows operating revenues of $134,800, selling expenses of $38,310, general and administrative expenses of $36,990, interest expense of $580, and income tax expense of $13,920. Holly's stockholders' equity was $280,000 at the beginning of the year and $320,000 at the end of the year. The company has 20,000 shares of stock outstanding at the end of the year. What is Holly's profit margin