2/1999 Troubleshooting Professional: The Math Behind
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Normal repair takes 30 minutes, but 1 in 10 takes 10 hours.
n=number of normal repairs in a 40 hour week
n*.5hours + t*10hours = 40 hours

Normal repair takes 15 minutes, but 1 in 10 takes 10 hours.
n=number of normal repairs in a 40 hour week
n*.25hours + t*10hours = 40 hours

Normal repair takes 30 minutes, but 1 in 10 takes 5 hours.
n=number of normal repairs in a 40 hour week
n*.5hours + t*5hours = 40 hours
