Given the information below, what is this firm's operating profit margin? Enter your response as a regular percent, rounded to the nearest first decimal. Do not enter dollar signs, percent signs, or commas. For example, if you calculated the decimal 0.3219, you would enter for your answer, 32.2. That reads 32.2 percent and is rounded conventionally. Revenue = $495 Cost of revenue = $245 Selling and general admin = $86 Research and development = $10 Interest expense = $32 Taxes = $18