A Time Study Showed That, on Average, the Productivity of a Worker

Multiple Choice

A time study showed that, on average, the productivity of a worker after t hours on the job can be modeled by , , where is the number of units produced per hour. After how many hours will productivity be maximized? Round your answer to two decimal places. ​​

A) 5.61 hours
B) 8.00 hours
C) 6.77 hours
D) 2.34 hours
E) 5.41 hours