A convenience store has two counters: one for quick food (such as sandwiches, donuts, and muffins), the other for drinks. Each counter serves its customers completely separately. The Food counter has 3 employees working independently to process customer orders (i.e. a customer is served by a single employee from start to finish).Each food order often takes an employee 2.5 minutes to fill on average.There is another employee working at the Drink counter by herself. It usually takes her 1 minutes to serve one drink customer. The peak hour of the day is form 7 - 8 AM, when 120 customers typically arrive in that hour. Among them, 60% are usually for food.

a) Compute the employee utilization rates at the Food counter and Drink counter between 7 - 8 AM?

Food counter employee utilization rate =

Drink counter employee utilization rate =

b) Assume the customer arrival rate and the speed of each employee to process an order stay the same.If the store owner wants the employee utilization rate to be at 80%, how many employees should be scheduled at the food counter between 7 - 8 AM?