How much would it cost a company if three workers arrive at work 15 minutes late, at a cost of $11/hour?

If your question is: How much would it cost the company if 3 workers arrived

at work 15 minutes late, at a cost $11/hrs per worker

15 minutes = 1/4 hrs

thus cost = 1/4*11 * 3 = 33/4 = $8 1/4