Multiple Choice
Ballard's Glass Company has a variable demand. Historically, its demand has ranged from 10 to 20 windows per day with an average of 15. John Ballard works eight hours a day, five days a week. Each order is one window and each window takes 26 minutes.
Ballard 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 Ballard continues to be the only worker?
a. 38.0 minutes
b. 112.4 minutes
c. 181.0 minutes
d. 410.0 minutes
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