Answer the following questions using the information below:
Kay's Window Company has a variable demand. Historically, its demand has ranged from 20 to 40 windows per day with an average of 30. Kay Ballard works eight hours a day, five days a week. Each order is one window and each window takes 13 minutes.
-Kay plans to add doors to its product line and anticipates that they will average 5 doors per day. Each door takes 12 minutes to install. What is the average waiting time, in minutes, if Kay continues to be the only worker?
A)60.0 minutes
B)390.0 minutes
C)96.5 minutes
D)720.0 minutes

Question

Quizplus · Accepted Answer

To find the average waiting time, we must first calculate the total processing time and compare it to the available time.

For the windows: 
- Average demand = 30 windows/day 
- Time to process one window = 13 minutes 
- Total processing time for windows = 30 x 13 = 390 minutes/day

For the doors: 
- Average demand = 5 doors/day 
- Time to process one door = 12 minutes 
- Total processing time for doors = 5 x 12 = 60 minutes/day

Total processing time for both windows and doors = 450 minutes/day

Since Kay works 8 hours a day, or 480 minutes, the available time is: 
480 - (30 x 13) = 90 minutes

Therefore, the average waiting time is: 
(450 - 90) / (30 + 5) = 96.5 minutes

So the answer is C.

Answer the Following Questions Using the Information Below