Answer the Following Questions Using the Information Below

Multiple Choice

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